exporter: Update --frames to accept "all" to export all frames

[AeroXuk]

Split from #20896

• Support --frames all to export all frames.

[kjarosh]

Your approach of parsing FrameSelection is the right way to do it!

[kjarosh]

I'm sorry for stalling your exporter PRs, I've been adding some tests for exporter so that we don't break existing use cases and we can cover future ones (#21029, #21042).

I think the PRs can be rebased now (the main.rs diff should apply to lib.rs now).

[AeroXuk]

I'm sorry for stalling your exporter PRs, I've been adding some tests for exporter so that we don't break existing use cases and we can cover future ones (#21029, #21042).

I think the PRs can be rebased now (the main.rs diff should apply to lib.rs now).

Thanks for the update, that's a great idea adding the test cases. I'll see if I can get some time this weekend to go through and update my still open PRs.