Batch data collected by log streams before sending to APM-Server

[lahsivjar]

Is your feature request related to a problem? Please describe.
Currently, the extension will drop logevents from subscribed logstreams if they are received before agent metadata is available.

Describe the solution you'd like
Extension should buffer data after processing and should send it only after metadata is available. Additionally, extension should also batch data to be more efficient.

Describe alternatives you've considered
N/A

Additional context
N/A