fix: lowercase getNonce address

Orders are sanitized to have lowercased addresses before pumping into
the DB. This means all `offerers` in the nonce db also have lowercased
addresses. However, the getNonce query does not do sanitization, so if
any integrator requests eip-55 cased nonces, it will not find results in
the db. This commit sanitizes

However, we should hold out for the frontend to make a fix incrementing
the nonce. It's currently relying on nonce randomness to get new nonces

lib/repositories/generic-orders-repository.ts

@@ -77,7 +77,7 @@ export class GenericOrdersRepository<
   }
 
   public async getNonceByAddressAndChain(address: string, chainId: number): Promise<string> {
-    const res = await this.nonceEntity.query(`${address}-${chainId}`, {
+    const res = await this.nonceEntity.query(`${address.toLowerCase()}-${chainId}`, {
       limit: 1,
       reverse: true,
       consistent: true,

test/handlers/get-nonce.test.ts

@@ -43,7 +43,7 @@ describe('Testing get nonce handler.', () => {
 
   it('Testing valid request and response.', async () => {
     const getNonceResponse = await getNonceHandler.handler(event as any, {} as any)
-    expect(getNonceByAddressMock).toBeCalledWith(requestInjectedMock.address, 1)
+    expect(getNonceByAddressMock).toBeCalledWith(requestInjectedMock.address.toLowerCase(), 1)
     expect(getNonceResponse).toMatchObject({
       body: JSON.stringify({ nonce: MOCK_NONCE }),
       statusCode: 200,