feat: token, introspect and revocation endpoint auth methods

Description

feat: token, introspect and revocation endpoint auth methods

Provide support for token, introspection and revocation endpoint auth methods, while supporting multiple methods at the same time.

BREAKING CHANGE: 🧨 Requires DB update

perun-oidc-server/src/main/java/cz/muni/ics/discovery/DiscoveryEndpoint.java

@@ -270,11 +270,22 @@ public class DiscoveryEndpoint {
 				AuthMethod.SECRET_BASIC.getValue(), AuthMethod.SECRET_POST.getValue(), AuthMethod.NONE.getValue()
 			)
 		);
+		m.put("introspection_endpoint_auth_methods_supported", List.of(
+						AuthMethod.SECRET_BASIC.getValue(), AuthMethod.SECRET_POST.getValue()
+				)
+		);
+		m.put("revocation_endpoint_auth_methods_supported", List.of(
+						AuthMethod.SECRET_BASIC.getValue(), AuthMethod.SECRET_POST.getValue()
+				)
+		);
+		m.put("device_endpoint_auth_methods_supported", List.of(
+						AuthMethod.SECRET_BASIC.getValue(), AuthMethod.SECRET_POST.getValue()
+				)
+		);
 		m.put("token_endpoint_auth_signing_alg_values_supported", toAlgNames(clientSymmetricAndAsymmetricSigningAlgs));
 		m.put("claim_types_supported", List.of("normal"));
 		m.put("claims_supported",
-			scopeTranslationService.getClaimsForScopeSet(scopeService.toStrings(scopeService.getAll()))
-		);
+			scopeTranslationService.getClaimsForScopeSet(scopeService.toStrings(scopeService.getAll())));
 		m.put("claims_parameter_supported", false);
 		m.put("request_parameter_supported", true);
 		m.put("request_uri_parameter_supported", false);