chaos_experimentation: allow querying for completed experiments

[bwitt]

Description

I'd like to query for only COMPLETED experiments via the GetExperiments call

clutch/api/chaos/experimentation/v1/experimentation.proto

Line 134 in f6043ae

rpc GetExperiments(GetExperimentsRequest) returns (GetExperimentsResponse) {

My understanding is this would require updating the Request proto here

clutch/api/chaos/experimentation/v1/experimentation.proto

Lines 47 to 52 in f6043ae

	enum Status {
	// Unspecified status.
	STATUS_UNSPECIFIED = 0;
	// Return experiments that are currently running.
	STATUS_RUNNING = 1;
	}

and then update the query to the backend db here

clutch/backend/service/chaos/experimentation/experimentstore/storer.go

Line 178 in f6043ae

` AND ($2 = 'STATUS_UNSPECIFIED' OR (experiment_run.cancellation_time is NULL AND NOW() > lower(experiment_run.execution_time) AND (upper(experiment_run.execution_time) IS NULL OR NOW() < upper(experiment_run.execution_time))))`

Complexity [S/M/L]:

Wireframes, Mockups, or Screenshots (if applicable)