feat: Implement NearSandbox, NearBlockchain and request lifecycle test#2590

anodar wants to merge 2 commits intomainnear/mpc:mainfrom

2452-implement-nearblockchain-abstraction-and-rpc-client-wrappernear/mpc:2452-implement-nearblockchain-abstraction-and-rpc-client-wrapperCopy head branch name to clipboard