[analyzer][docs] Add CSA release notes

We'll soon branch off, and start releasing clang-17.
Here is a patch, adjusting the release notes for what we achieved since
the last release.

I used this command to inspect the interesting commits:
```
git log --oneline llvmorg-16.0.0..llvm/main \
  clang/{lib/StaticAnalyzer,include/clang/StaticAnalyzer} | \
  grep -v NFC | grep -v -i revert
```

This filters in CSA directories and filters out NFC and revert commits.

Given that in the release-notes, we usually don't put links to commits,
I'll remove them from this patch as well. I just put them there to make
it easier to review for you.

I tried to group the changes into meaningful chunks, and dropped some of
the uninteresting commits.
I've also dropped the commits that were backported to clang-16.

Check out how it looks, and propose changes like usual.

---

FYI the `ninja docs-clang-html` produces the html docs, including the `ReleaseNotes`.
And the produced artifact will be at `build/tools/clang/docs/html/ReleaseNotes.html`.

Differential Revision: https://reviews.llvm.org/D155445

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