Add CIBA grant type to oidc-client

[Eng-Fouad]

Description

Add CIBA grant type: urn:openid:params:grant-type:ciba to OidcClientConfig, as some providers already support CIBA protocol (e.g. Keycloak).

OpenID Connect Client-Initiated Backchannel Authentication Flow - Core 1.0

quarkus/extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/OidcClientConfig.java

Lines 54 to 88 in 1eb8437

	public static class Grant {
	public static enum Type {
	/**
	* 'client_credentials' grant requiring an OIDC client authentication only
	*/
	CLIENT("client_credentials"),
	/**
	* 'password' grant requiring both OIDC client and user ('username' and 'password') authentications
	*/
	PASSWORD("password"),
	/**
	* 'authorization_code' grant requiring an OIDC client authentication as well as
	* at least 'code' and 'redirect_uri' parameters which must be passed to OidcClient at the token request time.
	*/
	CODE("authorization_code"),
	/**
	* 'urn:ietf:params:oauth:grant-type:token-exchange' grant requiring an OIDC client authentication as well as
	* at least 'subject_token' parameter which must be passed to OidcClient at the token request time.
	*/
	EXCHANGE("urn:ietf:params:oauth:grant-type:token-exchange"),
	/**
	* 'urn:ietf:params:oauth:grant-type:jwt-bearer' grant requiring an OIDC client authentication as well as
	* at least an 'assertion' parameter which must be passed to OidcClient at the token request time.
	*/
	JWT("urn:ietf:params:oauth:grant-type:jwt-bearer"),
	/**
	* 'refresh_token' grant requiring an OIDC client authentication and a refresh token.
	* Note, OidcClient supports this grant by default if an access token acquisition response contained a refresh
	* token.
	* However, in some cases, the refresh token is provided out of band, for example, it can be shared between
	* several of the confidential client's services, etc.
	* If 'quarkus.oidc-client.grant-type' is set to 'refresh' then `OidcClient` will only support refreshing the
	* tokens.
	*/
	REFRESH("refresh_token");

Implementation ideas

No response

[quarkus-bot]

/cc @pedroigor (oidc), @sberyozkin (oidc)