Release `2.0.0-alpha.1` (#708)

* Add release notes for `2.0.0-alpha.1`

* Clean up the `v1.5.0` release notes a bit

* Bump versions to `2.0.0-alpha.1`

* Alpha version for transcode

* Cargo.lock

Co-authored-by: ascjones <ascjones@gmail.com>
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