[ty] Add quick fix to remove redundant cast

[sqqueak]

Summary

Closes astral-sh/ty#3451

This PR adds the option to remove a redundant cast via quick fix. It is implemented using safe_edit as mentioned in the issue.

Test Plan

Updated and passed tests

[astral-sh-bot]

Typing conformance results

No changes detected ✅

Current numbers

The percentage of diagnostics emitted that were expected errors held steady at 89.36%. The percentage of expected errors that received a diagnostic held steady at 85.49%. The number of fully passing files held steady at 88/134.

[astral-sh-bot]

Memory usage report

Memory usage unchanged ✅

[astral-sh-bot]

ecosystem-analyzer results

No diagnostic changes detected ✅

Full report with detailed diff (timing results)

[MichaReiser]

We should add a test where cast is used as part of a larger expression and where inserting the value without parenthesizing changes precedence:

cast(int, x + y) * z

[sqqueak]

I just want to double check- as a conservative approach, we could always keep the parens around the contents of the cast, but this would introduce redundant parentheses (cast(int, secrets.randbelow(10)) becomes (secrets.randbelow(10)) with an extra pair of parentheses). Would this approach be acceptable or would it be preferred to do some precedence checking here?

[MichaReiser]

It would be preferred to avoid the parentheses if not necessary. That's also what we do in most places in Ruff.

You should be able to use OperatorPrecedence (python ast) to get the precedence of the value expression and the parent expression. You can then decide on whether to parenthesize the value based on how the two precedences compare