Allow to pass SentenceTransformers `task` and `prompt`

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### Feature request

I want to use https://huggingface.co/jinaai/jina-embeddings-v3 with via infinity server and client, but I cant find an example to run it with `task` as in `SentenceTransformers`:
```python
from sentence_transformers import SentenceTransformer

model = SentenceTransformer("jinaai/jina-embeddings-v3", trust_remote_code=True)

task = "retrieval.query"
embeddings = model.encode(
["What is the weather like in Berlin today?"],
task=task,
prompt_name=task,
)
```

### Motivation

It will not be practical to use infinity for jinaai embeddings (and some others) without this functionality. Actually, we can prefix our input text with relevant prompt, but we should not.

### Your contribution

I may be the first who will test and give feedback. If you hint me a contribution start point, I can try to cook a PR.

Start by tracing the infinity client and server interfaces for embedding requests, then compare their supported inputs with SentenceTransformers' task and prompt behavior for jinaai/jina-embeddings-v3. Done means both values can be passed through infinity so the shown retrieval.query example works without manually prefixing the text.

Written by the indexing model from the issue text.