feat: ucan stream consumer store remove size

[vasco-santos]

Part of metrics work #117

Adds system accumulated metric for store/remove size. With these, we can track total size of CARs requested for deletion. Until we have receipts, we will rely on the bucket to perform a Head request (given we do not have GC as well for now)

Needs:

• feat: ucan stream consumer store/add and store/remove count #151

[seed-deploy]

View stack outputs

• pr158-w3infra-CarparkStack

  Name	Value
  BucketName	carpark-pr158-0
  Region	us-east-2

• pr158-w3infra-SatnavStack

  Name	Value
  BucketName	satnav-pr158-0
  Region	us-east-2

• pr158-w3infra-UploadApiStack

  Name	Value
  ApiEndpoint	https://itogtaj3xl.execute-api.us-east-2.amazonaws.com
  CustomDomain	https://pr158.up.web3.storage

• pr158-w3infra-BusStack

• pr158-w3infra-ReplicatorStack

• pr158-w3infra-UcanInvocationStack

• pr158-w3infra-UploadDbStack