fix: preserve compiler error

[antazoey]

What I did

fixes: #26

How I did it

Follow advice from @fubuloubu

1. Raise compiler-centric error in the compile phase that actually preserves the std-err data OR uses the natural exception in the error output.
2. Other error improvements.

How to verify it

Make sure you can see the compile related errors in bad vyper code, e.g.:

ERROR: (VyperCompileError) vyper.exceptions.StructureException: Unsupported syntax for module namespace: Expr
  contract "/var/folders/hg/17b1zhsn1n3d8b4rgh6ntt_w0000gn/T/vyper-ajp3wgog.vy", line 1:0
  ---> 1 asdfasdfasdf
  -------^
       2

[15687] Failed to execute script vyper_compile

^ Not exactly sure where the [15687] Failed to execute script vyper_compile comes from though

Also, make sure good vyper good still compiles!

Checklist

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

[antazoey]

I just tried to compile some garbage, it seems to work better now:

ERROR: (VyperCompileError) vyper.exceptions.StructureException: Unsupported syntax for module namespace: Expr
  contract "/var/folders/hg/17b1zhsn1n3d8b4rgh6ntt_w0000gn/T/vyper-ajp3wgog.vy", line 1:0
  ---> 1 asdfasdfasdf
  -------^
       2

[15687] Failed to execute script vyper_compile

[fubuloubu]

[15687] Failed to execute script vyper_compile

^ Not exactly sure where the [15687] Failed to execute script vyper_compile comes from though

I think this is pyinstaller? maybe

[antazoey]

Would be nice to add a few test cases

Totally agree! Thanks. They are added now.