feat(mongodb): MQL Query & Shell Console (#1030)

[ZhuchkaTriplesix]

Closes #1030

Summary of Changes

• MQL Query & Shell Parser (MqlParser):
  • Implemented parser for MongoDB shell syntax:
    • Queries: find(), findOne(), count(), countDocuments(), aggregate()
    • Chained helper operators: .sort(), .limit(), .skip(), .project() / .projection()
    • CRUD/Mutations: insertOne(), insertMany(), updateOne(), updateMany(), deleteOne(), deleteMany(), drop()
    • Database commands: runCommand(), getCollectionNames(), stats()
    • Raw EJSON / JSON documents
  • Supported relaxed JavaScript object syntax: unquoted keys, single quotes, and constructor calls (ObjectId(...), ISODate(...), NumberLong(...), NumberInt(...), RegExp(...)).
• Mongo Query Executor (MongoQueryExecutor):
  • Abstracted query execution interface with default implementation delegating directly to MongoService.
  • Captures execution duration, affected/retrieved counts, document results, and mutation status.
• Mongo Query Workspace (MongoQueryWorkspace):
  • Multi-tab query editor using Querya UI Kit QueryaTabStrip.
  • Full-featured code editor with QueryaCodeEditor in JavaScript/MQL mode.
  • Keyboard shortcuts (Ctrl+Enter / Cmd+Enter) to execute queries.
  • Results bar displaying duration badge, result count badge, and Grid / JSON toggle buttons (MongoDocumentsTableView & MongoDocumentsJsonView).
  • Query history dialog displaying previously executed queries with insertion into active editor tab.
  • History persistence using LocalDb.instance.recordSqlQueryHistory.
• Navigation Integration:
  • Added 'Console' button in MongoDocumentsView filter bar and 'MQL Console' button in MongoCollectionsView header.
  • Added _Level.queryConsole with breadcrumb navigation in MongoExplorerView.
• Tests:
  • 13 comprehensive parser unit tests in test/features/mongodb/mql_parser_test.dart.
  • 6 widget tests in test/features/mongodb/mongo_query_workspace_test.dart covering tabs, shortcuts, error display, execution, and view mode switching.