feat: Add user roles, but do not yet enforce them (#1200)

* chore: Rework roles to be expandable by name alone

codersdk/organizationmember.go

@@ -0,0 +1,15 @@
+package codersdk
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+type OrganizationMember struct {
+	UserID         uuid.UUID `db:"user_id" json:"user_id"`
+	OrganizationID uuid.UUID `db:"organization_id" json:"organization_id"`
+	CreatedAt      time.Time `db:"created_at" json:"created_at"`
+	UpdatedAt      time.Time `db:"updated_at" json:"updated_at"`
+	Roles          []string  `db:"roles" json:"roles"`
+}