feat(repository): add bulkDelete() and bulkUpdate() for mass operations

[guillaumedelre]

Ref: #146

Implement BulkOperations without loading objects into memory:

• ClassMetadata: expose uniqueConstraints, hasUniqueConstraints(), getUniqueFields()
• MetadataFactory: read #[Unique] property-level and class-level into ClassMetadata
• RedisObjectManager: cache ClassMetadata per class; refactor buildUniqueConstraintPlan() to read pre-computed metadata instead of repeating reflection on every flush()
• AbstractObjectRepository: lazy ClassMetadata cache via getClassMetadata()
• RedisClientInterface + RedisClient + PredisClient: three new methods:
  • searchKeys() FT.SEARCH ... NOCONTENT (keys only, no deserialization)
  • searchKeysWithFields() FT.SEARCH ... RETURN n fields (keys + selected field values)
  • delMultiple() DEL key1 key2 ... (single command)
• bulkDelete(criteria): FT.SEARCH per batch + delMultiple; unique constraint keys
  (unique:{class}:{fields}:{values}) cleaned up automatically
• bulkUpdate(criteria, changes): FT.SEARCH per batch + hMSet/jsonSetProperty per key;
  throws BulkOperationException when changes target a unique-constraint field
• BulkOperationException: new exception for invalid bulk update on unique fields
• Functional tests: 18 tests covering Hash and JSON for all scenarios
• docs/advanced_usage.md: bulk operations section with decision table
• README.md: Bulk Operations section + feature list entry

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 74.07407% with 56 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.85%. Comparing base (3c6b698) to head (638fcd0).

Files with missing lines	Patch %	Lines
src/Client/RedisClient.php	0.00%	47 Missing ⚠️
src/Client/PredisClient.php	85.41%	7 Missing ⚠️
src/Om/Repository/AbstractObjectRepository.php	97.72%	2 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff              @@
##               main     #147      +/-   ##
============================================
- Coverage     87.47%   86.85%   -0.63%     
- Complexity      951     1017      +66     
============================================
  Files            70       71       +1     
  Lines          2228     2404     +176     
============================================
+ Hits           1949     2088     +139     
- Misses          279      316      +37     

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[guillaumedelre]

@clementtalleu I forgot to mention that for the case of a mass delete, this avoided having to do a foreach loop and call $objectManager->remove($entity); for example

// Before: looping and removing one by one
foreach ($entities as $entity) {
    $objectManager->remove($entity);
}
$objectManager->flush();

// After: single bulk delete query
$count = $repository->bulkDelete(['status' => 'inactive']);