The split2 module is very slow when handling large amounts of CDP data

[connor4312]

I noticed in a profile that the split2 module took a ridiculous amount of time when requesting a large source from a debugee:

Let's replace it with the optimized splitter I wrote for VS Code

[andreamah]

Are there verification steps for this?

[connor4312]

No good steps really, but folks have been using js-debug-nightly for copilot-chat where this was an issue and it seems to have worked, so I'll mark verified.