[main] Update version to 49.0.0, add 49.0.0 changelog (#16855)

* [branch-49] Update version to `49.0.0`, add changelog (#16822)

* Update version to 49.0.0

* Add 49.0.0 changelog

* prettier

* Update changelog and config

* chore: use `equals_datatype`  for `BinaryExpr` (#16813) (#16847)

* chore: use `equals_datatype` instead of direct type comparison for `BinaryExpr`

* chore: use `equals_datatype` instead of direct type comparison for `BinaryExpr`

(cherry picked from commit acff1b6)

* [branch-49] Final Changelog Tweaks (#16852)

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Co-authored-by: Oleks V <comphead@users.noreply.github.com>

Author: alamb