feat: add support for Line v2.1 OIDC provider and update related conf…

[jack-r-hong]

Hello, this is my first time contributing code. If you have any suggestions, please feel free to let me know. For OIDC Line Login, you only need to add id_token_key_type=JWK in the exchange step to issue tokens in HS256 format.

Related issue(s)

#1116

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
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• I confirm that this pull request does not address a security
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• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[CLAassistant]

All committers have signed the CLA.

[aeneasr]

Thank you very much! Could you please also add to the docs a guide for Line? See here for an example: ory/docs#1693

Sorry for the long wait on your PR and congrats to your first submission! :)

[David-Wobrock]

Hello!

Thank you very much for this @jack-r-hong ❤️
I tested it locally, because we are looking to set up LINE, and I can confirm that it fixes the bug discussed in #1116 ✔️

In order to contribute, here is the documentation PR ory/docs#2006 @aeneasr
Hoping to see this being released soon 🤞 🙏