Cleanup: convert caml_format to .res.

Author: cristianoc

CHANGELOG.md

@@ -41,6 +41,7 @@
 - Refactor uppercase exotic ident handling. https://github.com/rescript-lang/rescript-compiler/pull/6779
 - Fix `-nostdlib` internal compiler option. https://github.com/rescript-lang/rescript-compiler/pull/6824
 - Remove a number of ast nodes never populated by the .res parser, and resulting dead code. https://github.com/rescript-lang/rescript-compiler/pull/6830
+- Convert `caml_format` to `.res`. https://github.com/rescript-lang/rescript-compiler/pull/6834
 
 #### :nail_care: Polish