@hono/oauth-providers: custom state for Facebook auth

[jacoscaz]

Hello!

I just noticed that the facebookAuth function doesn't support passing custom values for the state param, which is always set to a random value:

https://github.com/honojs/middleware/blob/f997ee0d9a8b857e074d3f12b4db101cfd29d502/packages/oauth-providers/src/providers/facebook/facebookAuth.ts#L18

However, the googleAuth function does allow this:

https://github.com/honojs/middleware/blob/f997ee0d9a8b857e074d3f12b4db101cfd29d502/packages/oauth-providers/src/providers/google/googleAuth.ts#L20

Would you accept a PR that would allow passing custom state values through facebookAuth?

[yusukebe]

Hi @jacoscaz thank you for raising the issue.

@monoald What do you think of this?

[jacoscaz]

For the time being I'll vendor this package within my own project and test the proposed change. If everything works well I'd be happy to open a PR.