feat(flame_jenny): Public access to variables to allow load/save

[projectitis]

Description

Allows direct access to the variables in the VariableStorage class in jenny (via YarnProject.variables.variables).

This enables a user to implement a save game feature to save the variables and later restore them.

Checklist

• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

Related Issues

Closes #2687

[projectitis]

Looks like the test runner timed out. How can I restart the tests?

[spydon]

Looks like the test runner timed out. How can I restart the tests?

You can't, but I restarted it now, no idea why GitHub has started to kill that step.

[projectitis]

I'm going to go out on a limb and suggest that my change did not break collision detection 🤣

[spydon]

I'm going to go out on a limb and suggest that my change did not break collision detection 🤣

Ah you managed to hit both of the test pipeline problems. 😅
That collision detection test most likely hits some rounding error sometimes and therefore becomes flaky, something that should be looked into.