[SIOPv2] agree on the set of Static Self-Issued OpenID Provider Discovery Metadata

Need to agree on the set of Static Self-Issued OpenID Provider Discovery Metadata tied to openid: and discuss whether `subject_syntax_types_supported` should be defined.

Below is currently defined set of static SIOP Discovery Metadata.

```json
{
  "authorization_endpoint": "openid:",
  "issuer": "https://self-issued.me/v2",
  "response_types_supported": [
    "id_token"
  ],
  "scopes_supported": [
    "openid"
  ],
  "subject_types_supported": [
    "pairwise"
  ],
  "id_token_signing_alg_values_supported": [
    "ES256",
    "ES256K"
  ],
  "request_object_signing_alg_values_supported": [
    "ES256",
    "ES256K"
  ]
}
```

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