Move get monitor and search monitor action / request / responses to common-utils

[ohltyler]

Description

Moves get monitor and search monitor action, request, and response definitions (and all tests) from alerting to this plugin. This is so we can expose get monitor & search monitor functionality at the transport level using AlertingPluginInterface. This follows the same strategy as previous migrations - see #254 as an example.

• created getMonitor and searchMonitors fn in AlertingPluginInterface
• created GET_MONITOR_ACTION_NAME / GET_MONITOR_ACTION_TYPE, SEARCH_MONITORS_ACTION_NAME / SEARCH_MONITORS_ACTION_TYPE in AlertingActions
• moved over GetMonitorRequest / GetMonitorResponse / GetMonitorRequest and related tests
• removed the status field from GetMonitorResponse. This is so we can change the response from extending ActionResponse and ToXContentObject explicitly, and changing to BaseResponse, which has an override for getStatus(). Note the BaseResponse extends the same ActionResponse and ToXContentObject. This follows the same approach as done previously - see https://github.com/opensearch-project/alerting/pull/556/files as an example.

Confirmed the existing tests and added test in AlertingPluginInterfaceTests are passing. I've also confirmed this doesn't break functionality when alerting takes a dependency on these changes - there will be a follow up PR in alerting to change the dependencies from the alerting plugin definitions -> common-utils definitions.

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Attention: 88 lines in your changes are missing coverage. Please review.

Comparison is base (aa6246d) 75.14% compared to head (9b3f1be) 74.05%.

Files	Patch %	Lines
...arch/commons/alerting/action/GetMonitorResponse.kt	10.00%	53 Missing and 1 partial ⚠️
...earch/commons/alerting/action/GetMonitorRequest.kt	0.00%	23 Missing ⚠️
...ch/commons/alerting/action/SearchMonitorRequest.kt	0.00%	8 Missing ⚠️
...search/commons/alerting/AlertingPluginInterface.kt	72.72%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #566      +/-   ##
============================================
- Coverage     75.14%   74.05%   -1.10%     
- Complexity      874      877       +3     
============================================
  Files           130      133       +3     
  Lines          5685     5789     +104     
  Branches        698      708      +10     
============================================
+ Hits           4272     4287      +15     
- Misses         1104     1191      +87     
- Partials        309      311       +2     

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[ohltyler]

Related PR in alerting: opensearch-project/alerting#1305