Configure multistage settings

[mmutic]

Description

This PR adds default settings for the multistage feature of GenX. It adds a file called configure_settings_multistage, and calls the function in that file in run_genx_multistage so that users no longer need to specify all multistage settings in order to run a multistage case.

What type of PR is this? (check all applicable)

• Feature
• Bug Fix

Related Tickets & Documents

This is related to Issue #658 but does not directly fix it (another PR will address that issue).

Checklist

• Code changes are sufficiently documented; i.e. new functions contain docstrings and .md files under /docs/src have been updated if necessary.
• The latest changes on the target branch have been incorporated, so that any conflicts are taken care of before merging. This can be accomplished either by merging in the target branch (e.g. 'git merge develop') or by rebasing on top of the target branch (e.g. 'git rebase develop'). Please do not hesitate to reach out to the GenX development team if you need help with this.
• Code has been tested to ensure all functionality works as intended.
• CHANGELOG.md has been updated (if this is a 'notable' change).
• I consent to the release of this PR's code under the GNU General Public license.

How this can be tested

To test this, I deleted the multistage settings dictionary in example 6 (multistage) to see if GenX would still run successfully and it did. Note that the file still needs to be present, but does not need to have anything in it.

Post-approval checklist for GenX core developers

After the PR is approved

• Check that the latest changes on the target branch are incorporated, either via merge or rebase
• Remember to squash and merge if incorporating into develop

[github-actions]

Remaining comments which cannot be posted as a review comment to avoid GitHub Rate Limit

JuliaFormatter

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[lbonaldo]

Thanks @mmutic!