feat: Proof-of-concept Implementation for new save format (#5771)

[randombk]

This is an early proof-of-concept for #5771 and is not intended to be merged.

Checklist

Required

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax so it can be closed automatically.
• I have committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

Optional

Purpose of change

Describe the solution

Describe alternatives you've considered

Testing

Additional context

[autofix-ci]

Autofix has formatted code style violation in this PR.

I edit commits locally (e.g: git, github desktop) and want to keep autofix

1. Run git pull. this will merge the automated commit into your local copy of the PR branch.
2. Continue working.

I do not want the automated commit

1. Format your code locally, then commit it.
2. Run git push --force to force push your branch. This will overwrite the automated commit on remote with your local one.
3. Continue working.

If you don't do this, your following commits will be based on the old commit, and cause MERGE CONFLICT.

[randombk]

This iteration does not implement compression, only consolidates the maps folder, and has an iffy (but kinda working) incremental migration and backwards compatibility picture.

[randombk]

TODO: Avoid pulling in sqlite3 header into game.h

[randombk]

Derp - forgot the upsert clauses. Will be fixed in the next iteration.