Allow all commands that start with !eval to overcome spam rules

[eduherminio]

Type of pull request:

• Bug fix
• Feature
• Other

Description:

Context

When watching bot games, chat spam become very strict when trying to send the same command multiple times, which usually happens for !eval command.
This seems to be the piece of code responsible of detecting a message as spam. It basically detects duplicated messages (thanks @tsoj!)

There was an attempt to improve this on lichess side Relaxing spam rules for when being a normal user alone with just BOT accounts in chat, but it didn't make it.

Proposal

We can improve spectator experience on our side by allowing multiple commands to return our bot's eval.
The easiest way I could think of is doing so for every command that starts with (!eval), i.e. !eval1234, !evalplease, !eval with spaces.

This change has been applied to my bot and can be verified right now by watching any of his games and entering those commands one after each other.

Related Issues:

Checklist:

• I have read and followed the contribution guidelines.
• I have added necessary documentation (if applicable).
• The changes pass all existing tests.

Screenshots/logs (if applicable):

[eduherminio]

If this moves forward, happy to update any related documentation before or after merging.