Validate maxExportBatchSize in BatchSpanProcessor

[morigs]

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

Some exporters README's mention that the maxExportBatchSize setting of the BatchSpanProcessor must be maller or equal to maxQueueSize. But no validation is performed in code.
It's difficult to track the correctness of the values by hand, because one of the values can be modified and another use default...

Describe the solution you'd like

Perhaps the safest solution would be to write warning to logs and use default values if supplied settings are invalid

Describe alternatives you've considered

Another solution is to throw an error from the constructor. But this is a breaking change and unsafe

Additional context

We tried to add validation in application logic, but it's impossible, because we can't know default values for sure.

[samimusallam]

Can this issue be assigned to me? I would go with the first suggested solution, to use defaults if we get invalid settings.