Expose all methods using async/await API for iOS > 13 and macOS > 10.15

[hmazelier]

This simple PR introduce an async/await version of all the callback based methods.
All new async endpoints exist alongside the callback based ones, it therefore doesn't introduce any breaking change, just a larger choice.
Tests have also been simplified, which is a double benefit as it also tests the proxying logic (async endpoints are just wrappers around existing callback based methods).

[ajamaica]

This is a good add for foward looking. I think the CI is failing because of the version. Let me check if i can update it.

[hmazelier]

@ajamaica Glad you like it ! Yeah, it’s very likely due to the version! Keep me posted

[ajamaica]

I fix the CI. If you can rebase it I can test it again and merge it. I had to move to genesys go devnet to fix the ci.

[hmazelier]

@ajamaica I rebased but unfortunately some tests are failing, even in master branch :

• testGetBlockTime -> throws :

invalidResponse(Solana.ResponseError(code: Optional(-32001), message: Optional("Block 109479081 cleaned up, does not exist on node. First available block: 109650303"), data: nil))

• testGetConfirmedBlocks -> 0 blocks instead of 2
• testGetConfirmedTransaction -> throws Solana.RPCError.unknownResponse

[ajamaica]

Solana wipes history from time to time. There is no full blockchain history. Let me fix the tests to be more permanent using the current block.

[ajamaica]

I fixed the tests