- Add `createUploadUrl` to `car-store.js` as creating presigned s3 urls is a job for the bucket abstraction and having a thing called `signer` that wasn't a keypair for a DID for ucanto was confusing.
- Switch to the `@aws-sdk/s3-request-presigner` for creation of signed s3 urls to simplify credential management. The existing s3 client is reused.

TODO:
- add in content-length assertion for presigned url
- check if we can remove the amz header from store/add response. The checksum must be enforced via the URL, not from an additional header that the client may(not) send.

License: MIT
Signed-off-by: Oli Evans <oli@protocol.ai>

…actor

License: MIT
Signed-off-by: Oli Evans <oli@protocol.ai>

License: MIT
Signed-off-by: Oli Evans <oli@protocol.ai>

License: MIT
Signed-off-by: Oli Evans <oli@protocol.ai>

…actor

License: MIT
Signed-off-by: Oli Evans <oli@protocol.ai>

also add engines as a hint that folks need at least node 16.15 for --experimental-fetch to work

see: https://nodejs.org/docs/latest-v16.x/api/globals.html#fetch
see: https://docs.npmjs.com/cli/v6/configuring-npm/package-json#engines

License: MIT
Signed-off-by: Oli Evans <oli@protocol.ai>

License: MIT
Signed-off-by: Oli Evans <oli@protocol.ai>

License: MIT
Signed-off-by: Oli Evans <oli@protocol.ai>