Added basic support for redis sentinel based on https://github.com/Namoshek/laravel-redis-sentinel - #184

…eus_client_php fork

Brings in the 12 upstream commits since April 2025: the str_replace fix when reading metrics from Redis (PromPHP#185), Predis support (PromPHP#186) with the Redis storage split into AbstractRedis + RedisClients, PHP 8.2+ as minimum, PHP 8.5 in CI and guzzle 8 allowed.

Upstream moved the connection handling from Storage\Redis to RedisClients\PHPRedis, so the Sentinel support is re-applied there: Redis keeps the sentinel options and its public API (updateSentinelPrimary, getRedisSentinel, fromExistingConnection with an optional \RedisSentinel), and PHPRedis::ensureOpenConnection() asks Sentinel for the primary before connecting.

The reconnect loop is fixed on the way:
- it now retries: it only caught \RedisException, but getMaster() and connectToServer() already wrap it in StorageException, so no retry ever happened; the retry decision now looks at the wrapped \RedisException;
- 'reconnect' => -1 now retries indefinitely as documented; before, `while ($retries <= -1)` never ran and the client connected to the default host without asking Sentinel;
- running out of retries throws the last error instead of carrying on with no connection.

getRedisSentinel() throws StorageException when Sentinel is disabled instead of a fatal error on null.

Tests: two new Sentinel tests (reconnect -1 gets the primary; exhausting retries throws), and the misplaced @PHPStan-Ignore and trailing whitespace in RedisSentinelTest that made phpstan/phpcs fail. Full suite on PHP 8.4 against Redis 7 + Sentinel: 4211 tests OK (138 APC/APCng skipped, no apcu), phpstan and phpcs clean.

AI-Assisted-By: Claude Opus 5.5 (claude-opus-5-5, Anthropic)
AI-Oversight: merge, conflict resolution, reconnect fixes and tests generated and run by the AI; the author reviews the diff and approves the commit