feat(sqlmesh): add model for time to first response

warehouse/metrics_mesh/oso_metrics/time_to_first_response.sql

@@ -0,0 +1,81 @@
+select 
+  @metrics_sample_date(time_to_first_response_events.time) as metrics_sample_date, 
+  time_to_first_response_events.event_source,
+  time_to_first_response_events.to_artifact_id,
+  '' as from_artifact_id,
+  @metric_name() as metric,
+  AVG(time_to_first_response_events.amount) as amount
+from (
+  select
+    responded_at as `time`,
+    to_artifact_id,
+    event_source,
+    time_to_first_response_days as amount
+  from (
+    select
+      start_events.issue_number,
+      start_events.to_artifact_id,
+      start_events.created_at,
+      start_events.event_source,
+      min(resp.responded_at) as responded_at,
+      cast(
+        timestamp_diff(min(resp.responded_at), start_events.created_at, minute)
+        as float64
+      ) / 60.0 / 24.0 as time_to_first_response_days
+    from (
+      select
+        issue_number,
+        from_artifact_id as creator_id,
+        to_artifact_id,
+        time,
+        event_type
+      from metrics.timeseries_events_aux_issues_by_artifact_v0
+      where event_type in ('PULL_REQUEST_OPENED', 'ISSUE_OPENED')
+    ) as start_events
+    inner join (
+      select
+        issue_number,
+        from_artifact_id as responder_id,
+        to_artifact_id,
+        time as responded_at,
+        event_type
+      from metrics.timeseries_events_aux_issues_by_artifact_v0
+      where event_type in (
+        'PULL_REQUEST_MERGED',
+        'PULL_REQUEST_REVIEW_COMMENT',
+        'ISSUE_CLOSED',
+        'ISSUE_COMMENT'
+      )
+    ) as resp
+    on
+      start_events.issue_number = resp.issue_number
+      and start_events.to_artifact_id = resp.to_artifact_id
+      and start_events.creator_id != resp.responder_id
+      and (
+        (
+          start_events.event_type = 'ISSUE_OPENED'
+          and resp.event_type in (
+            'ISSUE_COMMENT', 'ISSUE_CLOSED'
+          )
+        )
+        or
+        (
+          start_events.event_type = 'PULL_REQUEST_OPENED'
+          and resp.event_type in (
+            'PULL_REQUEST_REVIEW_COMMENT', 'PULL_REQUEST_MERGED'
+          )
+        )
+      )
+    group by
+      start_events.issue_number,
+      start_events.to_artifact_id,
+      start_events.created_at
+  ) as time_to_first_response
+) as time_to_first_response_events
+where time_to_first_response_events.time BETWEEN @metrics_start('DATE') AND @metrics_end('DATE')
+group by 
+  metrics_sample_date,
+  time_to_first_response_events.event_source,
+  time_to_first_response_events.to_artifact_id,
+  from_artifact_id,
+  metric