Custom Editors: pass original edit objects back to extensions

For #88719

With this change, instead of passing custom editor edit json back and forth with the extension host, we keep the original edit objects on the extension host. This means that we can pass extensions back the exact same edit object they first hand to us. It also means that edits no longer need to be json serializable.

src/vs/workbench/api/common/extHostLanguageFeatures.ts

@@ -30,6 +30,7 @@ import { VSBuffer } from 'vs/base/common/buffer';
 import { encodeSemanticTokensDto } from 'vs/workbench/api/common/shared/semanticTokens';
 import { IdGenerator } from 'vs/base/common/idGenerator';
 import { IExtHostApiDeprecationService } from 'vs/workbench/api/common/extHostApiDeprecationService';
+import { Cache } from './cache';
 
 // --- adapter
 
@@ -1064,40 +1065,6 @@ class SignatureHelpAdapter {
 	}
 }
 
-class Cache<T> {
-	private static readonly enableDebugLogging = false;
-
-	private readonly _data = new Map<number, readonly T[]>();
-	private _idPool = 1;
-
-	constructor(
-		private readonly id: string
-	) { }
-
-	add(item: readonly T[]): number {
-		const id = this._idPool++;
-		this._data.set(id, item);
-		this.logDebugInfo();
-		return id;
-	}
-
-	get(pid: number, id: number): T | undefined {
-		return this._data.has(pid) ? this._data.get(pid)![id] : undefined;
-	}
-
-	delete(id: number) {
-		this._data.delete(id);
-		this.logDebugInfo();
-	}
-
-	private logDebugInfo() {
-		if (!Cache.enableDebugLogging) {
-			return;
-		}
-		console.log(`${this.id} cache size — ${this._data.size}`);
-	}
-}
-
 class LinkProviderAdapter {
 
 	private _cache = new Cache<vscode.DocumentLink>('DocumentLink');