API/behavior changes

⚠️ Breaking changes

rationale: the current parameters of the REST API are too numerous and confusing

Proposal:

remove query , inputField, inputType, pathToEmbeddings and embeddingObject
in replacement, add request and response

Parameters explanation

request : A JSON value that represents the request made by Meilisearch to the remote embedder. The text to embed must be replaced by the placeholder value “{{text}}” .
response: A JSON value that represents a fragment of the response made by the remote embedder to Meilisearch. The embedding must be replaced by the placeholder value "{{embedding}}".

Passing multiple texts and receiving multiple embeddings

As an optimization, it is possible to pass multiple texts in a single request to the remote embedder. In that case, multiple embeddings are retrieved in a single response of the remote embedder. Meilisearch expects as many embeddings from the server as texts were sent.
To enable that optimization, one must pass the "{{text}}" placeholder value inside a JSON value that is the first item of an array in the request, and pass “{{..}}” as the second item of the array.
Similarly, one must then pass the "{{embedding}}" placeholder value inside a JSON value that is the first item of an array in the response, and pass "{{..}}" as the second item of the array.

Error cases