feat: Modify batching implementation in java-logging

[minherz]

The Logging.write() interface aggregates multiple calls in batches in order to optimize a number of calls to entries.write Logging API. It happens only when Logging.getWriteSynchronicity() returns Synchronicity.ASYNC.
The current implementation of the batching logic is located in the gax repo and has few drawbacks that should be fixed.

This is an umbrella issue for all relevant FRs that modify the current batching implementation to provide the following features:

• expose batch configuration at logging client level
• review existing error handling strategies and extend them if needed
• modify current error reporting implementation

More technical details can be found in internal document.

[minherz]

Exposing batch configuration feature googleapis/gax-java#730

[minherz]

Changing error reporting mechanism in gax-batching feature googleapis/sdk-platform-java#1317