DefaultX509Source should have the ability to set up more options on WorkloadApiClient

[alwaysastudent]

Currently we can configure, spiffeSocketPath over io.spiffe.workloadapi.DefaultX509Source.X509SourceOptions.

But there are more configuration options available on io.spiffe.workloadapi.DefaultWorkloadApiClient.ClientOptions which we would like to customize while creating a new X509 source. Is it possible to make ClientOptions be configurable from X509SourceOptions as well?

Also would be great if retryExecutor can also be made customizable?

Sometimes we would like to run these as daemon threads instead.

[maxlambrecht]

It makes sense to me.

@alwaysastudent, would you be willing to submit a PR ?

[alwaysastudent]

Sure, thank you. I can submit a PR for this.