Refactor to use VVM `compile_files`

[fubuloubu]

Elevator pitch:

Use vvm.compile_files instead of vvm.compile_source

Value:

Currently we use compile_source which places the files into a temporary path, which makes errors much harder to parse. This change will show the correct file that generated the error

Dependencies:

Might be nicer to use alongside https://github.com/ApeWorX/ape/issues/660

Design approach:

Just switch the methods

Task list:

• [ ] Switch up the methods
• [ ] Do a ton of testing on different Vyper repos (Yearn-vaults, Curve DAO contracts)
• [ ] (optional) release update alongside core ape iterator refactor

Estimated completion date:

1 week

Design review:

Do not signoff unless:

• 1) agreed the tasks and design approach will achieve acceptance, and
• 2) the work can be completed by one person within the SLA. Design reviewers should consider simpler approaches to achieve goals.

(Please leave a comment to sign off)

[fubuloubu]

Looks like Brownie actually uses compile_standard instead, which leverages vyper-json mode (and is more flexible e.g. we can sneak in interfaces easier)