Expose cause of initialization errors

[ramosbugs]

Is your feature request related to a problem? Please describe.

The Client provides an initialized_async method to wait until it has completed initialization. The function returns false if an error occurs, but there doesn't seem to be a way to access the error for logging purposes. This could make it a challenge to debug initialization issues.

Describe the solution you'd like

A more idiomatic interface in Rust would be to have initialized_async return something like Result<(), InitError> and define an InitError type to describe the different failure conditions that might arise.

Describe alternatives you've considered

A separate method could be used to retrieve the error (e.g., returning Option<InitError>.

[keelerm84]

Thank you for the feedback! I have filed this request internally as sc-142483.

[aalexandrov]

:+1: for this.

[gabriel-lima]

+1 for this, I am having an unknown issue which for some reason client is not initializing.

[saks]

Experiencing the same issue, we had to spend quite a bit of time debugging and only found an issue once enabled TRACE logs. Would be great to have an explicit error returned when SDK key is wrong, or any other error happened (like timeout, etc).