* fix: Slowed global diag entity updates fixes [Rate-limit] Global visible device count [and others] #377

- Added _cached_ratelimit to BermudaGlobalEntity and applied to sensors
- Added ref_power_changed stamp and tied between ref_power changes and cache invalidation in entities, so calibration that causes increased distances show up immediately.
- allowed specifying custom interval to main _cached_rateliimit as well as global.