docs(pubsub): Add Pub/Sub ingestion from Kafka samples

[michaelpri10]

Add samples and tests for Cloud Pub/Sub ingestion from Kafka.

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This change is 

[michaelpri10]

/gcbrun

[scotthart]

/gcbrun

[scotthart]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @michaelpri10)

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google/cloud/pubsub/samples/topic_admin_samples.cc line 283 at r1 (raw file):

  [](pubsub_admin::TopicAdminClient client, std::string project_id,
     std::string topic_id, std::string cluster_arn, std::string msk_topic,
     std::string aws_role_arn, std::string gcp_service_account) {

For these strings that are only used once, either std::move them when they are used or change the parameter type from std::string to std::string const&.

Here and elsewhere in the changes.

[michaelpri10]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @scotthart)

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google/cloud/pubsub/samples/topic_admin_samples.cc line 283 at r1 (raw file):

Previously, scotthart (Scott Hart) wrote…

For these strings that are only used once, either std::move them when they are used or change the parameter type from std::string to std::string const&.

Here and elsewhere in the changes.

Done.

[scotthart]

/gcbrun

[scotthart]

Reviewable status: 0 of 1 files reviewed, all discussions resolved

[codecov]

Codecov Report

Attention: Patch coverage is 70.58824% with 30 lines in your changes missing coverage. Please review.

Project coverage is 92.90%. Comparing base (8ea0d5e) to head (dd0475a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
google/cloud/pubsub/samples/topic_admin_samples.cc	70.58%	30 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14954      +/-   ##
==========================================
- Coverage   92.91%   92.90%   -0.02%     
==========================================
  Files        2351     2351              
  Lines      210083   210185     +102     
==========================================
+ Hits       195193   195266      +73     
- Misses      14890    14919      +29     

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