Method names `createCredentialsOptions` and `getCredentialsOptions` are misleading

[ynojima]

vertx-auth/vertx-auth-webauthn4j/src/main/java/io/vertx/ext/auth/webauthn4j/WebAuthn4J.java

Line 64 in f2fe958

Future<JsonObject> createCredentialsOptions(JsonObject user);

vertx-auth/vertx-auth-webauthn4j/src/main/java/io/vertx/ext/auth/webauthn4j/WebAuthn4J.java

Line 76 in f2fe958

Future<JsonObject> getCredentialsOptions(@Nullable String username);

The names of these methods are misleading.
When placed side by side, createCredentialsOptions appears to be method that create CredentialsOptions and getCredentialsOptions appears to just return CredentialsOptions.
However, they actually create PublicKeyCredentialCreationOptions and PublicKeyCredentialGetOptions, respectively.

Since introducing a new module vertx-auth-webauthn4j is a good chance to make a breaking change from vertx-auth-webauthn, I think these methods should be renamed to createPublicKeyCredentialCreationOptions and createPublicKeyCredentialGetOptions.