Use utility class to contain map of converted classNames

[aaronlademann-wf]

Motivation

We want to change the global variable being used to keep track of props / state classes that have been converted to the new boilerplate by sibling migrators to a variable within an object that can be passed around by utilities / migrators that need it.

In doing so, we'll

• eliminate the risk of different areas of the code unintentionally interfering with each other's data (including in tests like this)
• make it easier to reason about where the data is used
• decouple code that reads/writes to this map from the consuming code

Changes

• Create a ClassToMixinConverter class, which contains a convertedClassNames getter to access the private _convertedClassNames field.
• Create a single instance of this class within main() of boilerplate_upgrade.dart, and pass the instance around to the migrators that make use of it as constructor arguments.

FYA @sydneyjodon-wk @joebingham-wk @greglittlefield-wf

[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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[joebingham-wk]

Looks awesome! Wrapping it in a class makes a lot of sense

+1

[greglittlefield-wf]

+1

[greglittlefield-wf]

#nit Instead of sharing this converter and having to worry about cleaning up after it, it'd be nice to have a fresh instance each time.