Save identified type on cache for future lookups on ChangeType.

[ammachado]

What's changed?

Types identified as fully-qualified are saved on the internal cache in ChangeTypeVisitor

What's your motivation?

This was identified while debugging #4030

Anything in particular you'd like reviewers to focus on?

Anyone you would like to review specifically?

No

Have you considered any alternatives or workarounds?

No

Any additional context

No

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[timtebeek]

Thanks once again!