Async Capacity API

[btoron]

Implement async versions of capacity and quota operations (12 methods total).

Methods include: get_capacity, get_quota_v2, get_quota_v1, update_quota_v1, update_quota_v2, get_activity_booking_options, get_booking_closing_schedule, update_booking_closing_schedule, get_booking_statuses, update_booking_statuses, show_booking_grid, get_booking_fields_deps.

See planned methods list in /Users/borja.toron/.claude/plans/magical-bouncing-curry.md