Add bulk operation for Engine and Indexers and use it for reindex operation

[alexander-schranz]

A new interface will support bulk operations. If the index does not support it we wall fallback to the normal save and delete functions:

    /**
     * @param iterable<array<string, mixed>> $saveDocuments
     * @param iterable<string> $deleteDocumentIdentifiers
     * @param array{return_slow_promise_result?: true} $options
     *
     * @return ($options is non-empty-array ? TaskInterface<array<string, mixed>> : null)
     */
    public function bulk(
        Index $index,
        iterable $saveDocuments,
        iterable $deleteDocumentIdentifiers,
        int $bulkSize = 100,
        array $options = [],
    ): TaskInterface|null;

fix #24

Adapters

• Memory a79c795
• Elasticsearch da7ecf4
• Opensearch c6ae340
• Meilisearch f40e005
• Algolia 6f70902
• Loupe 646fe1b
• Redisearch 3cdb192
• Solr 1eba8dd
• Typesense 90bd3f3

Todo

• Fix integration reindex tests
• Fix Meilisearch lowest 784d084

[tacman]

I think Meilisearch will be even easier to implement, and will see a big performance boost for adding documents.

[tacman]

Congrats and thanks!