Fix/sean/quote payload float precision

[auroter]

To test:

Easy Test:

1. Checkout and pull this branch
2. Docker compose down, docker compose up
3. Use Postman to get a quote
4. Execute the quote

Expected behavior: The quote returns string values for the $ cost breakdown and the quote can be executed normally, returning a TX ID and TX URL.

Hard Test:

1. Talk to me about how to test this in Unity. There are some dependencies that should be set locally instead of github, since they are not merged yet.

Expected Behavior: The Unity Demo executes transactions consistently using your metamask wallet.

[saito-sv]

LGTM

accidental