feat: add custom hooks to add sponsors

[Simon-He95]

Clear and concise description of the problem

For those who have not opened a sponsor but have received sponsorship from WeChat or other methods, I hope to have a custom hook that can pass in the user's github name and a sponsorship time, and then merge it into all sponsors.

Suggested solution

{
 customSponsors:[
  {
    username:'username',
    sponsortime:'now',
    ...
  }
 ]
}

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[Simon-He95]

I find customComposer that can meet my needs