Improve filtering of internal messages

[alexander-yevsyukov]

This PR applies latest base for improving the reliability of filtering internal messages that may be between computation nodes. Previously, the filtering relied only on the presence of @Internal annotation of the generated Java class.

Now, in the absence of the annotation, descriptors of the corresponding message types are also checked for:

• option (internal_type)=true set in the message, and if the option is not declared,
• option (internal_all)=true in the declaring file.

Other changes:

• Kotlin bumped to 1.8.0, detekt -> 1.22.0.
• Raw generic type usage warnings were addressed.
• Test fixtures for the routing features of the server module were moved under corresponding source set.

[codecov[bot]]

Codecov Report

Merging #1500 (0dca605) into master (978832e) will increase coverage by 0.01%. The diff coverage is 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1500 +/- ## ============================================ + Coverage 89.66% 89.68% +0.01% - Complexity 4901 4903 +2 ============================================ Files 631 631 Lines 15306 15305 -1 Branches 883 883 ============================================ + Hits 13724 13726 +2 + Misses 1274 1273 -1 + Partials 308 306 -2 ```