OAuthAccessTokenProvider constructed too early

[danielwiehl]

Describe the bug

If enabling OAuth authentication, the configured OAuthAccessTokenProvider is instantiated immediately when starting the application, causing problems if the access token provider depends on services only available after the application startup.

Expected behavior

• OAuthAccessTokenProvider should be constructed lazily when used for the first time
• MessageClient should be constructed lazily when used for the first time

Environment

• Angular Solace Message Client version: 14.0.0