🧹 v2.1.5 Add `tag pipes`, improve `ThreadPools`, add `VOLUME` to `Dockerfile`.

• Add the action tag pipes.
  Tags may be added or removed with the tag pipes action. Note that the flag --tags applies to existing tags for filtering; flags to be added or removed are positional arguments.

  ### Tag all `sql:main` pipes with `production` and `sync-daily`.
  mrsm tag pipes production sync-daily -c sql:main
  
  ### Remove the `production`` tag from all pipes tagged as `production`.
  mrsm tag pipes _production --tags production
  

• Add --tags support to register pipes.
  The action register pipe with the --tags flag will auto-tag the new pipes.

• Clean up warnings on Python 3.12.
  All instances of datetime.utcnow() have been replaced by datetime.now(timezone.utc).replace(tzinfo=None) (to preserve behavior). A full migration to timezone-aware datetimes would have to happen in a minor release.

• Improve timezone-aware datetime support for MSSQL.
  Passing a timezone-aware datetime as a date bound for MSSQL should now be fixed.

• Add an explicit VOLUME to the Dockerfile.
  The path /meerschaum is now explicitly set as a VOLUME in the Docker image.

• Add --tags filtering to the show tags action.

• Improve global ThreadPool handling.
  Global pools are now created on a per-worker (and per-class) basis, allowing for switching between workers within the same process. Note that global pools are maintained to allow for nested chunking and the limit the number of connections (e.g. avoid threads creating their own pools).

• Fix a bug when selecting only by negating tags.
  Pipes may now be selected by only specifying negated tags.

• Rename meerschaum.utils.get_pipes to meerschaum.utils._get_pipes to avoid namespace collissions.
  The functions get_pipes() and fetch_pipes_keys() are available at the meerschaum.utils module namespace.