fix(macro)!: consistent PHP names and deterministic output

[ptondereau]

Description

#[php_impl_interface] now registers each method under the name #[php_interface] declared, rename options follow one set of rules (change_cases_case, no name with change_case), and generated method flags come out in a fixed order.

Two items that get the same PHP name are a compile error inside one block and a registration error across blocks, instead of PHP silently dropping methods, replacing a class or stopping at startup.

Checklist

• I have read the contribution guidelines and the code of conduct.
• I have added tests that prove my code works as expected.
• I have added documentation if applicable.
• I have added a migration guide if applicable.

[coveralls]

Coverage Report for CI Build 35777977215

Coverage increased (+0.5%) to 70.142%

Details

• Coverage increased (+0.5%) from the base build.
• Patch coverage: 12 uncovered changes across 6 files (311 of 323 lines covered, 96.28%).
• No coverage regressions found.

Uncovered Changes

File	Changed	Covered	%
src/builders/enum_builder.rs	31	27	87.1%
crates/macros/src/enum_.rs	8	6	75.0%
crates/macros/src/impl_.rs	29	27	93.1%
crates/macros/src/interface.rs	47	45	95.74%
crates/macros/src/impl_interface.rs	7	6	85.71%
src/builders/class.rs	102	101	99.02%
Total (9 files)	323	311	96.28%

Coverage Regressions

No coverage regressions found.

---

Coverage Stats

Relevant Lines:	14147
Covered Lines:	9923
Line Coverage:	70.14%
Coverage Strength:	58.68 hits per line

---

💛 - Coveralls

[codspeed]

Merging this PR will not alter performance

✅ 30 untouched benchmarks

---

_{Comparing fix/dx1c-rename-consistency (3fa459a) with master (b8978a1)}