feat: GoogleMeetTools toolkit (create/list/update meetings)

[Mustafa-Esoofally]

Summary

Adds a GoogleMeetTools toolkit for creating, listing, and updating Google Meet meetings via the Google Meet API.

• libs/agno/agno/tools/google/meet.py (~22KB) — full toolkit implementation
• libs/agno/agno/tools/google/__init__.py — lazy-load registration for GoogleMeetTools
• libs/agno/pyproject.toml — new google_meet extras group (google-api-python-client, google-auth-httplib2, google-auth-oauthlib) + added to tools meta group
• cookbook/91_tools/google/meet_tools.py — usage example
• libs/agno/tests/unit/tools/test_google_meet.py — unit tests

Status: draft / needs review

Created from a feat-google-meet worktree during a worktree cleanup pass. The original branch was based on a much older main and had been merged via a different path. This branch starts from current main and needs:

• Review of the Meet API client initialization path vs. existing Google toolkits (GmailTools, GoogleCalendarTools) for auth consistency
• Run the cookbook against a real Meet account to verify the meeting-creation flow
• Decide whether to share the google-api-python-client dependency group with the other Google toolkits

Why

Meet is a common scheduling target for agents and wasn't covered by the existing Google toolkit set.