split codemod into two packages.

[bsutton]

I'm not certain if I should be raising this against your project as it's actually a fork of @greenealexander where he adds a 'non-interactive' mode.

This is a rather large commit as it splits codemod into two packages.

The original codemod package works as it always has (all unit tests pass).

The new codemod_core puts the scanning and patch logic into a separate package that can be used as an API. codemod_core performs no interaction with the CLI so it can be used in any Dart app.

I've also introduced a new ChangeSet which describes a set of patches to be applied to a single dart library.

This is possibly more performant than the existing code as it now reads/writes the file once.

This code somewhat inverts the logic as it applies all selectors to a file rather than all files to the selector.

If you want to process all files for a single selector then you should create a PatchGenerator for a single selector, apply the patches and then do the same for the next selector.

Here the code is, use it as you will or not.

[aviary2-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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[evanweible-wf]

Hey @bsutton thanks for the PR! This seems reasonable to me. I'm heading out for the holiday but will look at getting this merged when I'm back.