feat(php): add PHPStan analyse filter module

[LucianoVandi]

Summary

Adds a new php ecosystem module with a filter for PHPStan.

What it does

• injects --error-format=json for analyse / analyze
• groups errors by file, sorted by error count descending
• shows up to 10 files × 5 messages each, with truncation hints
• auto-detects vendor/bin/phpstan before falling back to phpstan on PATH
• falls back to text parsing when a custom --error-format is requested
• falls back safely to fallback_tail() if JSON parsing fails
• leaves utility commands like --version, list, and clear-result-cache as real passthrough

Rewrite coverage

Adds rewrite support for:

• phpstan analyse
• vendor/bin/phpstan analyse
• ./vendor/bin/phpstan analyse
• php vendor/bin/phpstan analyse

Tests

Added module tests covering:

• zero-error and error JSON output
• truncation behavior
• token savings on a realistic fixture
• malformed / empty output handling
• text fallback behavior
• classify / rewrite behavior, including negative coverage for utility commands

Validation

cargo fmt --all --check
cargo clippy --all-targets
cargo test --all

Notes

Snapshot tests were not added because insta is not currently a repo dependency. This PR uses explicit assertions and fixture-based coverage instead.

[CLAassistant]

All committers have signed the CLA.