scripts/app_manager: Add subcommand to manipulate tags

This will allow to:

• retrieve the last known tag for an application
• determine the next tag for an application (be it known or not)
• current list of tags of an application

This will raise when:

• providing both --next-tag and --last-tag for an application
• listing tags for an unknown application
• retrieving the last tag on an unknown application

Note that this also updates the pre-commit config to align it with the usual python module and actually run a pass on it that my configuration did not do so far (as a separated commit).

Sample cli help message:

$ app_manager tag --help
Usage: app_manager.py tag [OPTIONS] COMMAND [ARGS]...

  Manipulate application tag, for example either determine the last tag or
  compute the next one. Without any parameters this lists the current
  application tags.

Options:
  --help  Show this message and exit.

Commands:
  latest
  list
  next

Sample use cases:

# new app tag
$ docker run -v $PWD:/src --user 1000 -it build-deps tag next swh-core
refs/tags/swh-core-20230118.1
# list tags on unknown app -> raise
$ docker run -v $PWD:/src --user 1000 -it build-deps tag list swh-core
...
ValueError: No tag to display for application 'swh-core'
# List last tag on unknown app -> raise
$ docker run -v $PWD:/src --user 1000 -it build-deps tag latest swh-core
...
ValueError: No tag to display for application 'swh-core'
# List tags from known apps
$ docker run -v $PWD:/src --user 1000 -it build-deps tag list swh-loader-package
swh-loader-package-20221026.1
swh-loader-package-20221020.1
swh-loader-package-20220926.1
swh-loader-package-20220921.1
swh-loader-package-20220914.1
swh-loader-package-20220909.1
swh-loader-package-20220908.1
# List last known tag from a known app
$ docker run -v $PWD:/src --user 1000 -it build-deps tag latest swh-loader-package
refs/tags/swh-loader-package-20221026.1
# List next tag from a known app (it will increment the increment if already packaged
#  during the day)
$ docker run -v $PWD:/src --user 1000 -it build-deps tag next swh-loader-package
refs/tags/swh-loader-package-20230118.1

Refs. sysadm-environment#4724 (closed)