feat: add lib-dynamodb

[godu]

Hi, just need the @aws-sdk/client-dynamodb binding.

I'm not sure about some points :

• [ ] peerDeps configuration
• [ ] layer dependencies, maybe there is a better way to use with @effect-aws/client-dynamodb

paginateQuery & paginateScan are missing.

[floydspace]

hi @godu, thanks for another PR. I didn't even know that there is lib-dynamodb, marshal/unmarshal worked well to me so far, but let me think about peer deps, because I also needed it for implementing @effect-aws/core or @effect-aws/common to share some logic

[floydspace]

Okay, I reviewed it and tested it, well done! Still, I made some adjustments:

• added implicit dependency between lib-dynamodb and client-dynamodb, so nx builds them in order
• fixed layers, imo the default layer should be complete and should not require additional layers
• yesterday I added docgen, so I advice you when you work with projen always run pnpm default command to be always in sync (could be improved by pre-commit hook)
• use all possible errors for methods, they are all the same like in classic client
• errors are imported directly from client-dyanmodb, no need to re-export (anyway we require peer to be installed)
• peer configuration is fine, I would do the same