[Improvement] Add grant_type=password when use gravitino spark/flink runtime to submit the spark/flink job

### What would you like to be improved?

for example use spark examples, now the connector runtime jar support `grant_type=client_credentials` for client authentication (from https://gravitino.apache.org/docs/1.2.0/security/how-to-authenticate/), but we can't use user authentication.

the code snippet now is

```
private static Map clientCredentialsRequest(
String clientId, String clientSecret, List scopes) {
ImmutableMap.Builder formData = ImmutableMap.builder();
formData.put(GRANT_TYPE, CLIENT_CREDENTIALS);
if (clientId != null) {
formData.put(CLIENT_ID, clientId);
}
formData.put(CLIENT_SECRET, clientSecret);
formData.put(SCOPE, toScope(scopes));

return formData.build();
}

```

### How should we improve?

_No response_