Settlement merge flag

[nuts-rice]

Description

Addresses #2418 by a flag in driver config file as well as checks for settlement merge from solver

• skip-merge value in config file
• member functions for checking config value
• checks if should merge solutions or skip merge using Fetch or Skip
• flags if solution is MergeSkippable or not

How to test

1. Should be possible to skip merging solution when driver is flagged to Skip
2. Should be impossible to skip merging solution when driver is flagged to Fetch

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[nuts-rice]

I have read the CLA Document and I hereby sign the CLA

[sunce86]

Dependent on #2471

I suggest first merging the ☝️ and then continue.

[github-actions]

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