`python-extras` keyword for Python plugin

[lengau]

What needs to get done

It would be nice to have a python-extras keyword for the python plugin that will install the given package with any extras specified.

Example:

parts:
  codespell:
    plugin: python
    source: https://github.com/codespell-project/codespell
    source-type: git
    source-tag: v2.2.6
    source-depth: 1
    python-extras:
        - toml

would at the appropriate place run

pip install -U .[toml]

Why it needs to get done

Quality of life improvement

[syncronize-issues-to-jira[bot]]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-2520.

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