Fix: setRpc return rpc object

[boosik-sol]

setRpc should return rpc object, so I fixed it.

[wjthieme]

What is this needed for (not opposed to this change but just trying to understand in what scenario this would be useful)?

[boosik-sol]

What is this needed for (not opposed to this change but just trying to understand in what scenario this would be useful)?

This change is related to ticket LIQ-1211.
When working with whirlpool ts-sdk, developer often wants to reuse an exsiting RPC client - I ran into the same need while writing examples, since we can't assume the developer will only use Orca-SDK's functions.

As a result, we tend to write code like this,

const rpc = createSolanaRpc(...);
await setRpc(...);

rpc.someMethod(...);

If setRpc returned the RPC object, we could cut down on duplicate code and give developers more flexibility to take advantage of other Solana(from solana-kit) features.

[wjthieme]

🚀