🐛 v3.4.3 Add plugin version endpoint, fix shell login warning

[bmeares]

v3.4.3

• Add a plugin version API endpoint.
  The endpoint /plugins/{name}/version now returns a plugin's version string.

• Hide login warning on plugin updater thread.
  The plugins updater thread no longer will raise a login warning.

• Add precision kwarg aliases to get_current_timestamp().
  You may now treat Pipe.precision as kwargs for get_current_timestamp():

  import meerschaum as mrsm
  from meerschaum.utils.dtypes import get_current_timestamp
  
  pipe = mrsm.Pipe(
      'demo', 'precision', 'timestamp', instance='sql:local',
      precision={'unit': 's', 'interval': 30},
  )
  now = get_current_timestamp(**pipe.precision)
  print(now)
  # 2026-06-23 04:30:30+00:00