Live update applications from network explorer

[raykyri]

• Refactored packages/cli/commands/run.ts, moving most of the app initialization code into an AppInstance class.
• Commented out disabled canvas run options: --metrics, --replay, --memory.
• Added canvas run --admin option, which allows a user with API access to POST a new snapshot and contract to live-update the running application. Updated the network explorer with basic UI:

• TODO:
  • Enforce that --admin can only be used with --init and an application directory.
  • Overwrite the app stored in the application directory when an app is live updated while archiving past applications.
  • Enforce that --admin takes either an Ethereum key or anyone.
  • Request a SIWE signature from the user to update the application unless the admin is anyone.
  • Don't show the manage contract UI on the frontend if --admin isn't provided.
  • Check the update flow after committing a live-update to the backend.

How has this been tested?

• CI tests pass
• Tested with example-chat (including login, all signers, and exchanging messages)
• Tested with @canvas-js/test-network: (optional)

Does this contain any breaking changes to external interfaces?

• Contract interfaces
• Core interface
• CLI
• Data storage formats, including IndexedDB, SQLite, or filesystem storage (will this break existing apps?)