Add endpoints for the public API of Logs2Metrics

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#630

[jirikuncar]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov-io]

Codecov Report

Merging #140 (aafd77c) into master (8cc9c26) will decrease coverage by 0.18%.
The diff coverage is 39.06%.

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
- Coverage   39.14%   38.96%   -0.19%     
==========================================
  Files         719      739      +20     
  Lines       62098    64882    +2784     
==========================================
+ Hits        24310    25283     +973     
- Misses      37788    39599    +1811     

Impacted Files	Coverage Δ
...api_client/v2/models/logs_metric_create_request.rb	26.59% <26.59%> (ø)
...api_client/v2/models/logs_metric_update_request.rb	26.59% <26.59%> (ø)
...og_api_client/v2/models/logs_metric_update_data.rb	27.72% <27.72%> (ø)
...atadog_api_client/v2/models/logs_metric_compute.rb	27.83% <27.83%> (ø)
...tadog_api_client/v2/models/logs_metric_group_by.rb	27.83% <27.83%> (ø)
...og_api_client/v2/models/logs_metric_create_data.rb	28.03% <28.03%> (ø)
...datadog_api_client/v2/models/logs_metric_filter.rb	28.26% <28.26%> (ø)
..._client/v2/models/logs_metric_update_attributes.rb	28.42% <28.42%> (ø)
..._client/v2/models/logs_metric_create_attributes.rb	28.71% <28.71%> (ø)
..._client/v2/models/logs_metric_response_group_by.rb	28.72% <28.72%> (ø)
... and 564 more

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