#40186 feat(apps): apps-engine split, flip the switch

Proposed changes (including videos or screenshots)

• refactor(apps): point AppsEngine facade and IAppServerOrchestrator to local server/ paths
• refactor(meteor): migrate apps-engine/server/ imports to @rocket.chat/apps/server/
• refactor(meteor): migrate apps-engine/client/ imports to @rocket.chat/apps/client/
• refactor(core-services): migrate apps-engine/server/ imports to @rocket.chat/apps
• refactor(apps-engine): promote cross-boundary types to definition layer
• refactor(apps-engine): remove server, client, deno-runtime and scripts
• refactor(apps): source room options and OAuth2Client from apps-engine definition

Issue(s)

Steps to test or reproduce

Further comments

Related to the "Apps-Engine split" stack:

• #40395
• #40183
• #40184
• #40185
• This PR
• #40343

Deprecated

• #40187

Summary by CodeRabbit

• New Features

  • Added OAuth2 authentication client for app integrations with token management and authorization flows.
  • Enhanced external component system with new room and user information types.
  • Added filtering and sorting options for message and room queries.

• Refactoring

  • Migrated internal app infrastructure to a new package structure for improved modularity.
  • Updated Docker builds to align with structural changes.