Upgrade pyth sui sdk to use latest sui.js

[0xripleys]

There have been a couple of breaking changes between the current sui version in the pyth sdk (0.37) and the latest version (0.49):

• JsonRpcProvider has been deprecated
• the sui.js sdk has been broken down into smaller modules
• the bcs library also seems to be pretty different

[Ifechukwudaniel]

can you assign to me