feat(logging): generate AsyncWriteLogEntries()

[coryan]

This change is 

[codecov]

Codecov Report

Base: 93.97% // Head: 93.97% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (17eeadd) compared to base (b78b93f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10194      +/-   ##
==========================================
- Coverage   93.97%   93.97%   -0.01%     
==========================================
  Files        1528     1528              
  Lines      140657   140657              
==========================================
- Hits       132184   132181       -3     
- Misses       8473     8476       +3     

Impacted Files	Coverage Δ
google/cloud/internal/async_connection_ready.cc	89.36% <0.00%> (-4.26%)	⬇️
...integration_tests/schema_admin_integration_test.cc	98.88% <0.00%> (-1.12%)	⬇️
...cloud/pubsub/internal/subscription_session_test.cc	98.15% <0.00%> (-0.68%)	⬇️
...le/cloud/storage/internal/curl_download_request.cc	89.63% <0.00%> (+0.33%)	⬆️
google/cloud/pubsub/subscriber_connection_test.cc	98.36% <0.00%> (+0.54%)	⬆️
...bigtable/examples/bigtable_hello_instance_admin.cc	83.00% <0.00%> (+2.00%)	⬆️

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[google-cloud-cpp-bot]

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