chore: split queries.sql into files by table (#762)

coderd/database/queries/organizationmembers.sql

@@ -0,0 +1,22 @@
+-- name: GetOrganizationMemberByUserID :one
+SELECT
+	*
+FROM
+	organization_members
+WHERE
+	organization_id = $1
+	AND user_id = $2
+LIMIT
+	1;
+
+-- name: InsertOrganizationMember :one
+INSERT INTO
+	organization_members (
+		organization_id,
+		user_id,
+		created_at,
+		updated_at,
+		roles
+	)
+VALUES
+	($1, $2, $3, $4, $5) RETURNING *;