This commit improves project setup for IntelliJ IDEA by adding code style and inspection profile project files to version control.

Closes gh-29304


Some notes: - importing the existing idea/codeStyleConfig.xml as project code style config resulted in some diff - see the diff of this file vs .idea/codeStyles/Project.xml - I've added inspections profile with one non-default option (Instance field access not qualified with 'this'), this likely should be expanded - existing idea/codeStyleConfig.xml should be removed before merging

Comment From: snicoll

Thanks @vpavic. I've played with it a little bit in a fresh project and this seems to work quite nicely. I've added the copyright headers with the relevant scope so that headers of changed files can be updated automatically.