services/soroban-rpc: simulateTransaction, sendTransaction, and getTransactionStatus methods

[paulbellamy]

Depends on https://github.com/stellar/stellar-core/issues/3484, which is merged now.

This API should follow the soroban-rpc API Docs on Confluence, so that devs can swap out API server they are using soroban-rpc/cli serve/horizon seamlessly.

Compeleting this issue requires the following to be completed :

• [ ] https://github.com/stellar/go/issues/4593
• [x] https://github.com/stellar/go/issues/4594
• [x] https://github.com/stellar/go/issues/4595

[paulbellamy]

Depends on https://github.com/stellar/go/issues/4558

[sreuland]

@paulbellamy , can you confirm detail on expected outcome, for estimation, is this requesting a new web server to be created at new path of /exp/soroban-rpc and it will publish just the 3 soroban API endpoints mentioned?

[edit] i see, expectation here is that new skeleton web service is created in /exp/soroban-rpc via #4558 first, so effort here is plugging in new endpoints into an existing web service.

[paulbellamy]

Using the existing web service from #4558. The interesting part here is this is the first one using a DB (for tracking transactionStatus), so that will need to be added.

[EDIT] or maybe in-memory is good enough for meridian?

[jcx120]

Assumption: For Meridian, this is to support a single session, local service (not remotely hosted, shared instance)