[hardhat-move] Make the plugin more sophisticated

[swr1bm86]

Motivation

the hardhat-move plugin seems not well constructed (everything is in a single file) before and only support ethereum architecture, so I think a more matured hardhat plugin should be there for more developers to join and growth the whole ecosystem.

Future plan

there still many TODOs need to be done for this plugin:

• a downloader to download move executables for each concrete version specified in hardhat.config.js after there official releases on Github
• test task for move contracts build by move and async-move architecture
• file cache system for eliminating redundant compiling, contracts will only be compiled when it is a brand new contract or the file content has been changed since last build
• unit test and integration test for this plugin
• maybe it's better to move this plugin out from the move monorepo as a standalone repo for further development and maintainence

[swr1bm86]

will look at the test failures and fix them

[swr1bm86]

Hi @vgao1996, I have updated this PR, pls review again. Now the hardhat plugin focus on Ethereum architecture only. And I tried to add unit test for this plugin beside the integration tests in hardhat-example, since we currently use some experimental API like fs.promise which did not comply with ts-node properly, it seems impossible to run test with mocha and chai with it, so I'll leave it right now and may fix it in further update.

[vgao1996]

@zjhmale thanks for making the update and my apologies for the slow review. I've been quite busy this week but will have a closer look at this in the next few days.