Update tango-idl handling

• Merge MRs
• Is "COMPATIBILITY AnyNewerVersion" really correct for tango-idl cmake package config, https://gitlab.com/tango-controls/tango-idl/-/blob/main/CMakeLists.txt?ref_type=heads#L29
• Raise tango-idl version to 6.0.2 and tag
• Request 6.0.2 in find_package(tangoidl ...)
• Cleanup commits
• Create new conda package for MacOSX, https://github.com/conda-forge/tango-idl-feedstock
• Rebase llvm-latest MR once !1241 (merged) is merged

Close #1291 (closed)

Close #1228 (closed)

Close #1263 (closed)