refactor: make tilde prefixed

Author: nperez0111

packages/core/src/editor/BlockNoteEditor.ts

@@ -373,7 +373,7 @@ export class BlockNoteEditor<
    *
    * @internal
    */
-  public readonly _internal: {
+  public readonly "~internal": {
     /**
      * Stores positions of elements in the editor.
      */
@@ -698,7 +698,7 @@ export class BlockNoteEditor<
       this.pmSchema = getSchema(tiptapOptions.extensions!);
     }
 
-    this._internal = {
+    this["~internal"] = {
       positionStorage: new PositionStorage<BSchema, ISchema, SSchema>(this, {
         shouldMount: !this.headless,
       }),

packages/core/src/extensions/SuggestionMenu/SuggestionPlugin.ts

@@ -218,7 +218,7 @@ export class SuggestionMenuProseMirrorPlugin<
             suggestionPluginTransactionMeta !== null &&
             prev === undefined
           ) {
-            const trackedPosition = editor._internal.positionStorage.track(
+            const trackedPosition = editor["~internal"].positionStorage.track(
               newState.selection.from -
                 // Need to account for the trigger char that was inserted, so we offset the position by the length of the trigger character.
                 suggestionPluginTransactionMeta.triggerCharacter.length