Pattern Consumer username

[TitDevDu54]

Hi,

For my specific usage, I need to create a consumer with the minus character "-". Apisix does not authorize this character inside consumer username. The pattern is "^[a-zA-Z0-9_]+$".
Is there a serious reason why only the "_" is accepted ?
Will you accept a new pull request that adds the minus character into the pattern ?

Thanks for your support.