feat: add tables for support github teams (#311)

* update canonical schema for teams and membership

canonical-schema/V011__create_vcs_team.sql

@@ -0,0 +1,21 @@
+create table "vcs_Team" (
+  id text generated always as (pkey(source, uid)) stored primary key,
+  origin text,
+  "refreshedAt" timestamptz not null default now(),
+  uid text,
+  name text,
+  description text,
+  source text
+);
+
+create table "vcs_TeamMembership" (
+  id text generated always as (pkey(team, "user")) stored primary key,
+  origin text,
+  "refreshedAt" timestamptz not null default now(),
+  "user" text not null,
+  team text not null
+);
+
+
+alter table "vcs_TeamMembership" add foreign key ("user") references "vcs_User"(id);
+alter table "vcs_TeamMembership" add foreign key (team) references "vcs_Team"(id);