Add log file parameter to cli commands

[benmalef]

Proposed Changes

• Update the cli commands, adding --log-file parameter.
• Update the docs.extending

Screenshots

If the user doesn't use the --log-file par, the logs will be saved in the /tmp/.gandlf dir

If the user uses the --log-file parameter.

Checklist

• CONTRIBUTING guide has been followed.
• PR is based on the current GaNDLF master .
• Non-breaking change (does not break existing functionality): provide as many details as possible for any breaking change.
• Function/class source code documentation added/updated (ensure typing is used to provide type hints, including and not limited to using Optional if a variable has a pre-defined value).
• Code has been blacked for style consistency and linting.
• If applicable, version information has been updated in GANDLF/version.py.
• If adding a git submodule, add to list of exceptions for black styling in pyproject.toml file.
• Usage documentation has been updated, if appropriate.
• Tests added or modified to cover the changes; if coverage is reduced, please give explanation.
• If customized dependency installation is required (i.e., a separate pip install step is needed for PR to be functional), please ensure it is reflected in all the files that control the CI, namely: python-test.yml, and all docker files [1,2,3].

[github-actions]

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[sarthakpati]

Minor change requested. Also, I would suggest to add another point in the PR template:

- [ ] The `logging` library is being used and no `print` statements are left.