feat(embedding): Add input as vector for /embeddings

[hiro-v]

Fixes for #371

• Load model

curl --location 'http://127.0.0.1:3928/inferences/llamacpp/loadmodel' \
--header 'Content-Type: application/json' \
--data '{
   "llama_model_path": "/Users/hiro/Downloads/ggml-model-q4_k.gguf",
   "ctx_len": 2048,
   "ngl": 100,
   "cont_batching": false,
   "embedding": true,
   "system_prompt": "",
   "user_prompt": "\n### Instruction:\n",
   "ai_prompt": "\n### Response:\n"
 }'

• Embedding with input as string

curl --location 'http://localhost:3928/v1/embeddings' \
--header 'Content-Type: application/json' \
--header 'Accept: text/event-stream' \
--header 'Access-Control-Allow-Origin: *' \
--data '{
    "input": "Hello",
    "model": "embedding",
    "encoding_format": "float"
}'

• Embedding with input as vector

curl --location 'http://localhost:3928/v1/embeddings' \
--header 'Content-Type: application/json' \
--header 'Accept: text/event-stream' \
--header 'Access-Control-Allow-Origin: *' \
--data '{
    "input": ["Hello", "Nam", "here"],
    "model": "embedding",
    "encoding_format": "float"
}'

[tikikun]

LGTM