Add GetID() to model.BaseModel (#1336)

## Type of change

- [x] 🐹 Trivial/Minor

## Issue(s)

* #1334

## Test Plan

- [x] ⚡ Unit test

src/internal/model/model.go

@@ -61,3 +61,8 @@ type BaseModel struct {
 func (bm *BaseModel) Base() *BaseModel {
 	return bm
 }
+
+// GetID returns the baseModel.ID as a string rather than a model.StableID.
+func (bm *BaseModel) GetID() string {
+	return string(bm.ID)
+}

src/internal/model/model_test.go

@@ -3,6 +3,7 @@ package model_test
 import (
 	"testing"
 
+	"github.com/google/uuid"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/suite"
 
@@ -36,3 +37,11 @@ func (suite *ModelUnitSuite) TestValid() {
 		})
 	}
 }
+
+func (suite *ModelUnitSuite) TestGetID() {
+	bm := model.BaseModel{
+		ID: model.StableID(uuid.NewString()),
+	}
+
+	assert.Equal(suite.T(), string(bm.ID), bm.GetID())
+}