Add support for `console.log`

Overview

Brownie should support console.log as implemented by Buidler

Specification

1. Access to the functionality comes from an import: import "@nomiclabs/buidler/console.sol";
2. The imported contract is available at: nomiclabs/buidler/packages/buidler-core/console.sol
3. console is a library. log sends a call to an empty account with a particular signature depending on the param type(s) given. It will be possible to extract these from the debug_traceTransaction output.

Considerations

1. How to handle importing console.sol without reliance on NPM? The solution will likely require expanding the brownie package manager.
2. The implementation must produce consistent results with buidler. Should examine their test cases around this and write similar ones for Brownie.

[anticlimactic]

how about now? because it looks like #1043 has been merged. @iamdefinitelyahuman

[zmeghji]

Emitting events with the data you want to log could be an alternative if you don’t want to use hardhat: https://permanentiteration.com/console-log-alternative-for-brownie/