Logs SDK - Batching LogRecordProcessor

[kaylareopelle]

Implement a batching LogRecordProcessor for the Logs SDK.

Batching processor: https://opentelemetry.io/docs/specs/otel/logs/sdk/#batching-processor

Needs the following:

• OnEmit: https://opentelemetry.io/docs/specs/otel/logs/sdk/#onemit
• ShutDown: https://opentelemetry.io/docs/specs/otel/logs/sdk/#onemit
• Force Flush: https://opentelemetry.io/docs/specs/otel/logs/sdk/#forceflush-1

[github-actions]

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[kaylareopelle]

WIP, unreviewed code for this issue, along with other parts of the logs SDK, can be found in kaylareopelle#6