[Enh] `producer changes` command

[Faryshta]

Proposal for a command that reads the commits and filter the ones that start with [Enh], [Bug], [Fix], [BC break] since the last tag release.

Then updates the CHANGES document with the new information. With format

• {commit description} {commit id} {commit author}

Alternatively, it can Read the CHANGES document and finds the last applied commit, then finds only the ones applies after that one.