Running `sourcegen -w` doesn't re-trigger on changes in additional source directories about bleep

[oyvindberg]

If you could try two things:

• move the sources: ./src/smithy to scripts project. changing thing in the shared project shouldn't affect the sourcegen in another project
• another options is that the sourcegen structure supports a sourceGlobs field, which are for other files read by the sourcegen script outside of the build. I think this is relative to the project folder for shared

It would be great if you can experiment a bit with two options and report back, so we can update the docs

[KaranAhlawat]

I tried both approaches.

1. This works well, and the sourceGen is fast enough so no complains here.
2. This feels like it should work. The description of sourceGlobs says that it is relative to the project of the script. So for me, I should add a sourceGlobs: ../shared/src/smithy to it. That however, doesn't seem to have any effect. Neither does sourceGlobs: ./src/smithy, assuming it's relative to the shared project and not the scripts project.