[changelog] v0.64.0 (#220)

* [changelog] generate new entries for 0.64.0

* [changelog] start sorting through 0.64 changelog items

* [changelog] prune 0.64 Fixes section

* [changelog] Generated changelog from v0.64.0-rc.4

* Update CHANGELOG.md

A bunch of removals and cleanups. 

Didn't categorize unknown yet. Didn't filter Failed to parse yet either.

* Update CHANGELOG.md

* Update CHANGELOG.md

* Update CHANGELOG.md

* Update CHANGELOG.md

* Remove todos

* Categorizing Unknown commits

* Categorize unknown changes

* Moving an "added" line from Removed to Added section

* Update CHANGELOG.md

* Cleaning up deprecations and breaking changes

* add newly cherry-picked commit

Co-authored-by: Jeremy Deutsch <[email protected]>
Co-authored-by: Eli White <[email protected]>
Co-authored-by: Bartosz Kaszubowski <[email protected]>
Co-authored-by: Mike Grabowski <[email protected]>