Add a capability for OIDC client extension

As requested here:
quarkiverse/quarkus-openapi-generator#829 (review)

(cherry picked from commit deefc68)

Author: gsmet

core/deployment/src/main/java/io/quarkus/deployment/Capability.java

@@ -114,6 +114,7 @@ public interface Capability {
     String OPENSHIFT_CLIENT = OPENSHIFT + ".client";
 
     String OIDC = QUARKUS_PREFIX + ".oidc";
+    String OIDC_CLIENT = OIDC + ".client";
 
     String KEYCLOAK_AUTHORIZATION = QUARKUS_PREFIX + ".keycloak.authorization";
 

extensions/oidc-client/runtime/pom.xml

@@ -37,6 +37,11 @@
             <plugin>
                 <groupId>io.quarkus</groupId>
                 <artifactId>quarkus-extension-maven-plugin</artifactId>
+                <configuration>
+                    <capabilities>
+                        <provides>io.quarkus.oidc.client</provides>
+                    </capabilities>
+                </configuration>
             </plugin>
             <plugin>
                 <artifactId>maven-compiler-plugin</artifactId>