Snapshot: Add possibility to have only one micro simulation object

[tjwsch]

Adds functionality to only create one micro simulation object in the snapshot computation if all micro simulations are initialized with the same configuration and no information is transferred from one solve call to another.
Checklist:

• I made sure that the CI passed before I ask for a review.
• I added a summary of the changes (compared to the last release) in the CHANGELOG.md.
• If necessary, I made changes to the documentation and/or added new content.
• I will remember to squash-and-merge, providing a useful summary of the changes of this PR.

[IshaanDesai]

Looks good 👍 In what situations would this be useful? This could be something worth mentioning in the documentation (see the comment above).

[tjwsch]

I added a comment regarding when it is useful to apply this option