Part of #12

This adds consumer stack to w3filecoin. Main goal of this stack is to wire replication event from w3infra with write CAR metadata into car table.

Stack includes:

• EventBus reference imported from w3infra ARN via ENV var
• SQS Queue to queue CARs pending registration for a ferry
• Lambda Function to handle batches of CARs pending registration from the SQS queue

Lambda Function:

Other details:

• Integration tests included where upload-client is used to upload files into w3infra's upload-api (Staging), so that we can see if events triggered are consumed here. Note that needs feat: replicator event w3infra#138

Still to figure out based on Spade integration decisions + commP in client:

• do we need to wire up store dynamo table from w3infra?

Closes #12