[v1.16] Collection metadata docs (#1986)

* wip: initial docs

* docs: Go snippets

Signed-off-by: Anush008 <anushshetty90@gmail.com>

* docs: Java snippets

Signed-off-by: Anush008 <anushshetty90@gmail.com>

* docs: Removed TODO!

Signed-off-by: Anush008 <anushshetty90@gmail.com>

* docs: C# snippets

Signed-off-by: Anush008 <anushshetty90@gmail.com>

* move collection metadata section into collection info

* fix code fence mismatch in markdown

* Remove empty line

---------

Signed-off-by: Anush008 <anushshetty90@gmail.com>
Co-authored-by: Anush008 <anushshetty90@gmail.com>
Co-authored-by: trean <trean.mi@gmail.com>
Co-authored-by: Tim Visée <tim@visee.me>

qdrant-landing/content/documentation/headless/snippets/update-collection/with-metadata/_description.md

@@ -0,0 +1 @@
+Update collection metadata. This example demonstrates how to overwrite a specific field in the collection's metadata while leaving other fields unchanged. Collection metadata can be any JSON object that provides additional information about the collection.

qdrant-landing/content/documentation/headless/snippets/update-collection/with-metadata/bash.md

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+```bash
+curl -X PATCH http://localhost:6333/collections/{collection_name} \
+  -H 'Content-Type: application/json' \
+  --data-raw '{
+    "metadata": {
+      "my-metadata-field": {
+        "key-a": "value-a",
+        "key-b": 42    
+      }
+    }
+  }'
+```

qdrant-landing/content/documentation/headless/snippets/update-collection/with-metadata/csharp.md

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+```csharp
+using Qdrant.Client;
+using Qdrant.Client.Grpc;
+
+var client = new QdrantClient("localhost", 6334);
+
+await client.UpdateCollectionAsync(
+	collectionName: "{collection_name}",
+	optimizersConfig: new OptimizersConfigDiff { IndexingThreshold = 10000 },
+	metadata: new()
+	{
+		["my-metadata-field"] = new Dictionary<string, Value>
+		{
+			["key-a"] = "value-a",
+			["key-b"] = 42
+		},
+	}
+);
+```

qdrant-landing/content/documentation/headless/snippets/update-collection/with-metadata/go.md

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+```go
+import (
+	"context"
+
+	"github.com/qdrant/go-client/qdrant"
+)
+
+client, err := qdrant.NewClient(&qdrant.Config{
+	Host: "localhost",
+	Port: 6334,
+})
+
+client.UpdateCollection(context.Background(), &qdrant.UpdateCollection{
+	CollectionName: "{collection_name}",
+	OptimizersConfig: &qdrant.OptimizersConfigDiff{
+		IndexingThreshold: qdrant.PtrOf(uint64(10000)),
+	},
+	Metadata: qdrant.NewValueMap(map[string]any{
+		"my-metadata-field": map[string]any{
+			"key-a": "value-a",
+			"key-b": 42,
+		},
+	}),
+})
+```

qdrant-landing/content/documentation/headless/snippets/update-collection/with-metadata/http.md

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+```http
+PATCH /collections/{collection_name}
+{
+    "metadata": {
+        "my-metadata-field": {
+            "key-a": "value-a",
+            "key-b": 42
+        }
+    }
+}
+```

qdrant-landing/content/documentation/headless/snippets/update-collection/with-metadata/java.md

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+```java
+import java.util.Map;
+
+import static io.qdrant.client.ValueFactory.value;
+
+import io.qdrant.client.grpc.Collections.OptimizersConfigDiff;
+import io.qdrant.client.grpc.Collections.UpdateCollection;
+
+client
+    .updateCollectionAsync(
+        UpdateCollection.newBuilder()
+            .setCollectionName("{collection_name}")
+            .setOptimizersConfig(
+                OptimizersConfigDiff.newBuilder().setIndexingThreshold(10000).build())
+            .putAllMetadata(
+                Map.of(
+                    "my-metadata-field",
+                    value(
+                        Map.of(
+                            "key-a", value("value-a"),
+                            "key-b", value(42)))))
+            .build())
+    .get();
+```

qdrant-landing/content/documentation/headless/snippets/update-collection/with-metadata/python.md

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+```python
+client.update_collection(
+    collection_name="{collection_name}",
+    metadata={
+        "my-metadata-field": {
+            "key-a": "value-a",
+            "key-b": 42
+        }
+    },
+)
+```

qdrant-landing/content/documentation/headless/snippets/update-collection/with-metadata/rust.md

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+```rust
+use qdrant_client::qdrant::{UpdateCollectionBuilder};
+use qdrant_client::Qdrant;
+use serde_json::{json, Value};
+use std::collections::HashMap;
+
+let client = Qdrant::from_url("http://localhost:6334").build()?;
+
+let mut metadata: HashMap<String, Value> = HashMap::new();
+metadata.insert("my-metadata-field".to_string(), json!({
+    "key-a": "value-a",
+    "key-b": 42
+}));
+
+client
+    .update_collection(
+        UpdateCollectionBuilder::new("{collection_name}").metadata(metadata),
+    )
+    .await?;
+```

qdrant-landing/content/documentation/headless/snippets/update-collection/with-metadata/typescript.md

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+```typescript
+client.updateCollection("{collection_name}", {
+  metadata: {
+    "my-metadata-field": {
+      "key-a": "value-a",
+      "key-b": 42
+    }
+  },
+});
+```