[Swift projection tooling / dev-ex] Showcase changes in bindings in PRs

[jkurdek]

In order to make PR reviews easier it might be beneficial to showcase the bindings difference which they new changes bring. Currently the diff contains only changes to the tooling making it harder for the reviewer to visualize what are the consequences of the changes.

We can maintain a small set of generated code (commited to the repo) which will showcase the most popular scenarios. Making changes to the source generator will result in regeneration which will be visible in the PR diff.

[matouskozak]

That's a great idea. We could add a job which would run on main only that would generate the code and automatically open PRs with the latest bindings examples (when there would be a diff). On PRs, we would be comparing against the examples generated from main.