Support Content-Encoding header to reduce payload size

[gmourier]

Sending a gzip payload with Content-Encoding header is not valid on POST/PUT - indexes/:uid/documents. The server expects to receive a JSON format.

It could be interesting to be able to send compressed data to MeiliSearch when indexing documents to reduce the size of network footprint when large batches of documents are sent.

[gmourier]

It was added in v0.30 🪄

📚 https://docs.meilisearch.com/reference/api/overview.html#content-encoding

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