Update beta branch version to 2.1.0-beta.3.

Update beta branch version to 2.1.0-beta.2.

Configure beta branch with version and experimental flag.

Bump version to 2.0.0 🎉 and update changelog.

Bump beta version to 2.0.0-rc.1 and update changelog.

Bump beta version to 2.0.0-beta.5 and update changelog.

Bump beta version to 2.0.0-beta.4 and update changelog.

Bump beta version to 2.0.0-beta.3 and update changelog.

Bump beta version to 2.0.0-beta.2 and update changelog.

Set v2.0.0-beta.1 version, beta flag and changelog.