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/inference/cohere-query/go.go

@@ -0,0 +1,31 @@
+package snippet
+
+import (
+	"context"
+	"time"
+
+	"github.com/qdrant/go-client/qdrant"
+)
+
+func Main() {
+	client, err := qdrant.NewClient(&qdrant.Config{
+	    Host:   "xyz-example.qdrant.io",
+	    Port:   6334,
+	    APIKey: "<paste-your-api-key-here>",
+	    UseTLS: true,
+	})
+
+	client.Query(ctx, &qdrant.QueryPoints{
+		CollectionName: "{collection_name}",
+		Query: qdrant.NewQueryNearest(
+			qdrant.NewVectorInputDocument(&qdrant.Document{
+				Text:  "a green square",
+				Model: "cohere/embed-v4.0",
+				Options: qdrant.NewValueMap(map[string]any{
+					"cohere-api-key":   "<YOUR_COHERE_API_KEY>",
+					"output_dimension": 512,
+				}),
+			}),
+		),
+	})
+}