Add methods to get batches #506

Job	Run time
meilisearch-version	2s
integration-tests-against-rc (PHP 7.4 & Guzzle 6)	1m 1s
integration-tests-against-rc (PHP )	49s
integration-tests-against-rc (PHP )	52s
integration-tests-against-rc (PHP )	57s
integration-tests-against-rc (PHP )	50s
integration-tests-against-rc (PHP )	50s
integration-tests-against-rc (PHP )	51s
integration-tests-against-rc (PHP )	50s
integration-tests-against-rc (PHP )	51s
integration-tests-against-rc (PHP )	49s
integration-tests-against-rc (PHP )	50s
integration-tests-against-rc (PHP )	1m 7s
integration-tests-against-rc (PHP )	58s
integration-tests-against-rc (PHP )	50s
integration-tests-against-rc (PHP )	50s
integration-tests-against-rc (PHP )	1m 0s
integration-tests-against-rc (PHP )	58s
integration-tests-against-rc (PHP )	55s
integration-tests-against-rc (PHP )	1m 8s
integration-tests-against-rc (PHP )	51s
integration-tests-against-rc (PHP )	51s
integration-tests-against-rc (PHP )	50s
integration-tests-against-rc (PHP )	51s
	20m 41s

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