remove `-f ast` from compiler outputs

[cyberthirst]

Version Information

• vyper Version (output of vyper --version): 533682d

What's your issue about?

• remove -f ast option and decrease the compiler's surface
• in most cases the annotated ast is the preferred option

---

• leaving this open for discussion in case someone might have a usecase for ast without annotations (e.g. error recovery)
• as per the referenced version, the output doesn't even contain imports making it even less useful

[cyberthirst]

further, the following deepcopy:

vyper/vyper/compiler/phases.py

Line 166 in 533682d

vyper_module = copy.deepcopy(self.vyper_module)

should be most likely run after the imports are resolved.

if the imports were added to the ast output, the output might be incorrect as the imports would not get deepcopied and thus could be annotated if we requested (in this specific order) -f annotated_ast, ast

[charles-cooper]

we could raise a DeprecationWarning for a few releases and see if anybody complains