Improve execution speed by using provider hooks

[cgewecke]

Since web3.currentProvider is injected into the Truffle test context it should be possible to hijack it and wrap

• readers onto outgoing calls (e.g. tx.input)
• processors onto responses (e.g receipts)

Same for buidler although this needs some additional investigation since the provider there comes with it's own wrapping...

Think we can do this safely since we'll be operating inside the async envelope that mocha waits for. There will be data loss - the mocha per test output - not sure how valuable this is anyway.

It could be a 'fast' option for industrial sized suites that need to run ~ as quickly as a spec reporter.

[alcuadrado]

Same for buidler although this needs some additional investigation since the provider there comes with it's own wrapping...

I'm thinking about adding provider wrapping functionality to the Buidler plugin system. I think it would be useful to implement things like hardware wallet integrations. It should also work for this kind of things. What do you think?

In the meantime, I think you can monkey-patch the provider from the Buidler Runtime Environment.

[cgewecke]

@alcuadrado Yes a wrapping API would be really cool! Monkey patching is fine too though :)

[cgewecke]

This is done at hardhat-gas-reporter. Will track doing the same for ganache at #225