Request to keeep length of PAT stable

[JohnNiang]

Your current Halo version

2.13.0-SNAPSHOT

Describe this feature

In #4598, I implemented the PAT mechanism using JWT as token format. But the token is too long, making it inconvenient for end users to use.

Maybe we could follow up https://github.blog/2021-04-05-behind-githubs-new-authentication-token-formats/ to create a shorter random PAT instead of using JWT.

Additional information

/kind improvement
/area core

[JohnNiang]

There is a disadvantage worth noting, short token means that it cannot carry payload and must store in the database.

Therefore, I plan to remove roles information from PAT first to keep length of PAT stable.

/retitle Request to keeep length of PAT stable