chore: Update flame_3d CHANGELOG.md to match main + changes [flame_3d]

[luanpotter]

Description

Update flame_3d CHANGELOG.md to match main + changes.

This is the second step in merging flame_3d into main. Before we do a final rebase of main back, the last "conflict" is the changelog file (as can be seen on the temporary PR diff).

In order to solve this conflict, this does the following steps:

• Collect the changes from flame_3d compared to the current base branch version of main (i.e.: everything that was added to the changelog; this turns out to be two entries for the same day, 2024-09-16).
• Replace the CHANGELOG.md file with the latest from current main
• Add back the missing entries, but I have doctored the days to be today (2024-12-10), in order to not "alter the past". I am happy with keeping the original date, though. No strong preference either way.

Once this is merged, the diff PR should show no conflict, and we should be able to finally rebase it with current main to get rid of all the extraneous files. Finally, we can create a new merge PR and the diff should be exactly what we want.

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.