[pylint] Implement invalid-bytes-returned (E0308)

[tibor-reiss]

Add pylint rule invalid-bytes-returned (PLE0308)

See #970 for rules

Test Plan: cargo test

[codspeed-hq]

CodSpeed Performance Report

Merging #10959 will not alter performance

_{Comparing tibor-reiss:add-E0308-invalid-bytes-returned (ced76b9) with main (06b3e37)}

Summary

✅ 30 untouched benchmarks

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

[MichaReiser]

Should this rule and the other invalid-*-returned rules also flag the case where the method has no return statement

class Test:
	def __bytes__(self):
		print("nope")

[tibor-reiss]

I added this case as well. If this becomes the consensus, I can also add it to the already included bool (E0304) and str (E0307) cases.

[tibor-reiss]

@MichaReiser As it turned out, the no-return case is not that simple: if there is just a pass/ellipsis/raise statement, then this rule should not raise. However, if there is e.g. a print statement and a raise statement, then it should raise - see the tests for examples.

[charliermarsh]

I changed this to use is_stub for detecting the other cases.