[K9] Add aggregation and metric fields to the RuleQuery

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#548

[jirikuncar]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #457 into master will decrease coverage by 26.18%.
The diff coverage is 0.00%.

Impacted Files	Coverage Δ
...v2/datadog/model_security_monitoring_rule_query.go	0.00% <0.00%> (-11.71%)	⬇️
...odel_security_monitoring_rule_query_aggregation.go	0.00% <0.00%> (ø)
...dog/model_security_monitoring_rule_query_create.go	0.00% <0.00%> (-18.69%)	⬇️
api/v1/datadog/api_hosts.go	0.00% <0.00%> (-72.76%)	⬇️
api/v1/datadog/api_snapshots.go	0.00% <0.00%> (-72.42%)	⬇️
api/v1/datadog/api_events.go	0.00% <0.00%> (-71.29%)	⬇️
api/v1/datadog/model_widget_definition.go	0.00% <0.00%> (-71.02%)	⬇️
api/v1/datadog/api_pager_duty_integration.go	0.00% <0.00%> (-70.98%)	⬇️
api/v1/datadog/api_logs.go	0.00% <0.00%> (-70.00%)	⬇️
api/v1/datadog/api_organizations.go	0.00% <0.00%> (-70.00%)	⬇️
... and 449 more