Automated snippet conversion by scripts

These changes are purely mechanical to differentiate them from manual
fixes/adjustments made in the next commit.
This results in broken code as some snippets contain errors.

Made in four steps:
1. Run ./migrate-snippet.py that converts `.md` files to code files
   and perhaps adds missing lines under `// @hide` comments.
2. Sort Java imports.
3. Remove old `.md` files.
4. Run ./generate.md to produce `*/generated/*.md` files.

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/csharp.cs

@@ -0,0 +1,13 @@
+using Qdrant.Client;
+
+public class Snippet
+{
+	public static async Task Run()
+	{
+		await client.FacetAsync(
+		    "{collection_name}",
+		    key: "size",
+		    exact: true,
+		);
+	}
+}

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/generated/java.md

@@ -1,5 +1,5 @@
 ```java
- client
+client
       .facetAsync(
           Points.FacetCounts.newBuilder()
               .setCollectionName(collection_name)

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/go.go

@@ -0,0 +1,11 @@
+package snippet
+
+
+
+func Main() {
+	res, err := client.Facet(ctx, &qdrant.FacetCounts{
+	    CollectionName: "{collection_name}",
+	    Key:            "key",
+	    Exact:          true,
+	})
+}

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/java.java

@@ -0,0 +1,14 @@
+package com.example.snippets_amalgamation;
+
+public class Snippet {
+        public static void run() throws Exception {
+                client
+                      .facetAsync(
+                          Points.FacetCounts.newBuilder()
+                              .setCollectionName(collection_name)
+                              .setKey("foo")
+                              .setExact(true)
+                              .build())
+                      .get();
+        }
+}

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/python.py

@@ -0,0 +1,9 @@
+from qdrant_client import QdrantClient  # @hide
+
+client = QdrantClient(url="http://localhost:6333")  # @hide
+
+client.facet(
+    collection_name="{collection_name}",
+    key="size",
+    exact=True,
+)

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/rust.rs

@@ -0,0 +1,13 @@
+use qdrant_client::qdrant::FacetCountsBuilder;
+
+pub async fn main() -> anyhow::Result<()> {
+    client
+        .facet(
+             FacetCountsBuilder::new("{collection_name}", "size")
+                 .limit(10)
+                 .exact(true),
+         )
+         .await?;
+
+    Ok(())
+}

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/typescript.ts

@@ -0,0 +1,8 @@
+import { QdrantClient } from "@qdrant/js-client-rest"; // @hide
+
+const client = new QdrantClient({ host: "localhost", port: 6333 }); // @hide
+
+client.facet("{collection_name}", {
+    key: "size",
+    exact: true,
+});