Allow optional logging of equivalent httppie commands

[ghost]

near-api-js builts on top of:

• https://docs.near.org/api/rpc/introduction

For debugging purposes, would be useful to optionally (with a commandline argument) also print out the equivalent API RPC command that can be run directly on the commandline (via httppie for instance)

These commands allows diagnosing if the issue is before the API RPC call (error in configuration or near/near-cli or near/near-api-js) or after (errors with API RPC in near/nearcore or wrong usage of API RPC)

These httppie commands are not easy to manually build by hand, so printing out an equivalent command that can simply be copied pasted would be extremely useful

Example httppie command (as can be seen to be quite verbose) that it should print out.

http post https://rpc.testnet.near.org jsonrpc=2.0 id=dontcare method=query \
  params:='{
    "request_type": "view_account",
    "finality": "final",
    "account_id": "nearkat.testnet"
  }'

It should be a simply using the values of the variables request and response to optionally log out to stdout both the proper request and returned response in the httppie format.

• near-api-js/packages/near-api-js/src/utils/web.ts

  Lines 30 to 34 in 232e35e

  	const response = await fetch(connectionInfo.url, {
  	method: json ? 'POST' : 'GET',
  	body: json ? json : undefined,
  	headers: { ...connectionInfo.headers, 'Content-Type': 'application/json' }
  	});