feat: implement rgbpp-sdk-service

Implement a JSON-RPC service that wraps the functionality of rgbpp-sdk and provides it to SDKs in other languages

Changes

Implement rgbpp-sdk-service, base on nest.js and json-rpc-2.0
Integrate rgbpp-sdk, provide JSON-RPC methods such as generate transaction and other related functions
Add Dockerfile and docker-compose.yml for deploy
- For some reasons, we need to update the packageManger in package.json (see https://github.com/pnpm/pnpm/issues/6424)
Add Vercel deploy button (available after merged into the main branch)