Merge topic 'astgrep-cmstrcat'

557c44b93e cmStrCat: use character literals where possible
23779057fd cmStrCat: combine neighboring arguments where possible
483d13daf4 ast-grep: add a rule to turn strings into characters
61743471d9 ast-grep: add a rule to find adjacent string literals in cmStrCat calls

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !10790