feat: implement `get_imports()` API method

[antazoey]

What I did

fixes: #43 Fixes: APE-406 This is needed for Etherscan verification and I think also helps Ape core compile Vyper projects (IICR why we did it in ape-solidity).

This is step 1 to getting Verification working for Vyper contracts.

How I did it

How to verify it

Checklist

• [x] Passes all linting checks (pre-commit and CI jobs)
• [x] New test cases have been added and are passing
• [ ] Documentation has been updated
• [x] PR title follows Conventional Commit standard (will be automatically included in the changelog)

[antazoey]

• [x] handle from contract import foo style

[NotPeopling2day]

@fubuloubu can give some more detail, but there's at least a third way for Vyper imports, using .json files. We'll want to account for in the tests as well.

1. import ...
2. from ... import
3. json file

https://vyper.readthedocs.io/en/v0.2.11/compiling-a-contract.html#vyper-json

[fubuloubu]

@fubuloubu can give some more detail, but there's at least a third way for Vyper imports, using .json files. We'll want to account for in the tests as well.

1. import ...
2. from ... import
3. json file

https://vyper.readthedocs.io/en/v0.2.11/compiling-a-contract.html#vyper-json

Yes, you can pull in ABI JSON and ethPM Manifest files this way

[antazoey]

@fubuloubu can give some more detail, but there's at least a third way for Vyper imports, using .json files. We'll want to account for in the tests as well.

1. import ...
2. from ... import
3. json file

https://vyper.readthedocs.io/en/v0.2.11/compiling-a-contract.html#vyper-json

That sounds good.. but maybe a little complex enough to warrant its own PR?

[fubuloubu]

@fubuloubu can give some more detail, but there's at least a third way for Vyper imports, using .json files. We'll want to account for in the tests as well.

1. import ...
2. from ... import
3. json file

https://vyper.readthedocs.io/en/v0.2.11/compiling-a-contract.html#vyper-json

That sounds good.. but maybe a little complex enough to warrant its own PR?

Agreed