feat(events_stream): Add document_event_number column to events_stream_v1 tables and event_id column to events_stream views (DENG-9800) (#8596)

* feat(events_stream): Add `document_event_number` column to `events_stream_v1` tables (DENG-9800).

* feat(events_stream): Add `event_id` column to `events_stream` views.

Author: sean-rose

sql_generators/glean_usage/templates/cross_channel_events_stream.query.sql

@@ -20,6 +20,7 @@ WITH events_stream_union AS (
   {% endfor %}
 )
 SELECT
+  CONCAT(document_id, '-', document_event_number) AS event_id,
   *,
   {% if extras_by_type %}
     {{ event_extras_by_type_struct(extras_by_type) }} AS extras

sql_generators/glean_usage/templates/events_stream.view.sql

@@ -5,6 +5,7 @@ CREATE OR REPLACE VIEW
   `{{ project_id }}.{{ events_stream_view }}`
 AS
 SELECT
+  CONCAT(document_id, '-', document_event_number) AS event_id,
   *,
   {% if extras_by_type %}
     {{ event_extras_by_type_struct(extras_by_type) }} AS extras

sql_generators/glean_usage/templates/events_stream_v1.query.sql

@@ -135,10 +135,12 @@ SELECT
   event.name AS event_name,
   ARRAY_TO_STRING([event.category, event.name], '.') AS event, -- handles NULL values better
   from_map_event_extra(event.extra) AS event_extra,
+  (event_offset + 1) AS document_event_number,
 FROM
   base
 CROSS JOIN
   UNNEST(events) AS event
+  WITH OFFSET AS event_offset
   {% if app_name == "firefox_desktop" %}
     WHERE
       -- See https://mozilla-hub.atlassian.net/browse/DENG-7513