feat: head sync

[daniele-dcl]

Added data for the head-sync feature to the comms proto.

It's 2 floats representing local-space yaw and pitch angles of the head (local space as in relative to the avatar transform).

[github-actions]

Test this pull request on NPM or Yarn

• The @dcl/protocol package can be tested in scenes by running the following NPM command:

  npm install "https://sdk-team-cdn.decentraland.org/@dcl/protocol/branch//dcl-protocol-1.0.0-19926435716.commit-a1a9800.tgz"

• The @dcl/protocol package can be tested in scenes by running the following YARN command:

  yarn add "https://sdk-team-cdn.decentraland.org/@dcl/protocol/branch//dcl-protocol-1.0.0-19926435716.commit-a1a9800.tgz"