Add CLI option to customize the Boolean getter

[wing328]

Description

To add another CLI option (booleanGetterPrefix) for Java generator based on the discussion in #7344 (comment)

Swagger-codegen version

Latest master

Related issues/PRs

#7344
#7261

Suggest a fix/enhancement

If anyone wants to contribute the enhancement, please reply to let us know.

[karthikkondapally]

@wing328 let me know, if i can be of any help. but i may need some initial pointers/help, as i am still new to swagger

[dkellenb]

I have implemented the desired changes in dkellenb/swagger-codegen/tree/issue-7638.

[macjohnny]

@dkellenb thanks for your implementation. could you please open a PR to include the changes into swagger codegen?

[dkellenb]

OK, done.