Fix bug adding import to a list of imports containing duplicate imports.

[nguyenhoan]

What's changed?

Problem:

• The presence check does not take the member of static imports into consideration
• The comparison by size cannot handle the case where the original imports contain duplicated imports making its the size be equal to that of the ideally ordered, distinct imports even after adding a new import

Fix: check the presence using the fully qualified names of imports.

What's your motivation?

Fix #4196

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

Anyone you would like to review specifically?

Have you considered any alternatives or workarounds?

Any additional context

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 for working out the fix! In hind sight comparing the original and ideal number of imports seems strange. I like your suggestion to explicitly check for presence better, thanks!

[nguyenhoan]

Thank you!