[dashboards formula and functions] Rename objects for formula and functions to be more generic

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#834

[codecov-io]

Codecov Report

Merging #220 (baedf55) into master (52efcf3) will decrease coverage by 0.92%.
The diff coverage is 48.27%.

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
- Coverage   35.87%   34.94%   -0.93%     
==========================================
  Files         826      826              
  Lines       70776    71952    +1176     
==========================================
- Hits        25389    25144     -245     
- Misses      45387    46808    +1421     

Impacted Files	Coverage Δ
...v1/models/formula_and_function_query_definition.rb	26.82% <ø> (ø)
...els/formula_and_function_event_query_definition.rb	30.70% <25.00%> (ø)
...ula_and_function_event_query_definition_compute.rb	29.00% <33.33%> (ø)
...mula_and_function_event_query_definition_search.rb	26.59% <33.33%> (ø)
...odels/formula_and_function_event_query_group_by.rb	29.00% <33.33%> (ø)
.../formula_and_function_event_query_group_by_sort.rb	29.70% <33.33%> (ø)
...ls/formula_and_function_metric_query_definition.rb	29.24% <33.33%> (ø)
...s/formula_and_function_process_query_definition.rb	34.14% <33.33%> (ø)
lib/datadog_api_client/v1.rb	99.80% <100.00%> (ø)
...ib/datadog_api_client/v2/api/key_management_api.rb	8.69% <0.00%> (-63.59%)	⬇️
... and 597 more

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[nmuesch]

/azp run

[azure-pipelines]

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