feat(workflow): Time To Resolution API

[iProgramStuff]

This endpoint will be used to graph the mean "time to resolution" for your team over time.

Returns a dict where each key is a day between start and end (calculated via start/end/statsPeriod params) - and is either zero-filled or contains the count of issues and average time to resolution for issues resolved in that bucket.

[github-actions]

This PR has a migration; here is the generated SQL

BEGIN;
--
-- Create model GroupHistory
--
CREATE TABLE "sentry_grouphistory" ("id" bigserial NOT NULL PRIMARY KEY, "status" integer NOT NULL CHECK ("status" >= 0), "prev_history_date" timestamp with time zone NULL, "date_added" timestamp with time zone NOT NULL, "actor_id" bigint NULL, "group_id" bigint NOT NULL, "prev_history_id" bigint NULL, "project_id" bigint NOT NULL, "release_id" bigint NULL);
ALTER TABLE "sentry_grouphistory" ADD CONSTRAINT "sentry_grouphistory_actor_id_085453d6_fk_sentry_actor_id" FOREIGN KEY ("actor_id") REFERENCES "sentry_actor" ("id") DEFERRABLE INITIALLY DEFERRED;
ALTER TABLE "sentry_grouphistory" ADD CONSTRAINT "sentry_grouphistory_prev_history_id_905ec402_fk_sentry_gr" FOREIGN KEY ("prev_history_id") REFERENCES "sentry_grouphistory" ("id") DEFERRABLE INITIALLY DEFERRED;
CREATE INDEX "sentry_grouphistory_actor_id_085453d6" ON "sentry_grouphistory" ("actor_id");
CREATE INDEX "sentry_grouphistory_group_id_5dedb22b" ON "sentry_grouphistory" ("group_id");
CREATE INDEX "sentry_grouphistory_prev_history_id_905ec402" ON "sentry_grouphistory" ("prev_history_id");
CREATE INDEX "sentry_grouphistory_project_id_c2403854" ON "sentry_grouphistory" ("project_id");
CREATE INDEX "sentry_grouphistory_release_id_a18ee4ae" ON "sentry_grouphistory" ("release_id");
CREATE INDEX "sentry_grouphistory_project_id_status_release_id_dbbe6354_idx" ON "sentry_grouphistory" ("project_id", "status", "release_id");
COMMIT;

[wedamija]

Looks good in general. Could you base this branch off of the parent branch so that the diff only includes the changes in this pr?

[iProgramStuff]

Looks good in general. Could you base this branch off of the parent branch so that the diff only includes the changes in this pr?

Yeah, that's my bad.