feat: Added a vector rest query interface supporting Cypher

[qingfeng-occ]

• Added a vector rest query interface supporting Cypher.

vector:

curl -X POST http://localhost:8000/graph/query/vector \
-H "Content-Type: application/json" \
-d '{
	"query": "MATCH (e:Person) RETURN e.name, e.embedding",
	"column": "e.embedding",
	"vector": [0.1, 0.2, 0.3],
	"metric": "cosine",
	"top_k": 5
}'

query_text:

curl -X POST http://localhost:8000/graph/query/vector \
-H "Content-Type: application/json" \
-d '{
	"query": "MATCH (e:Person) RETURN e.name, e.embedding",
	"column": "e.embedding",
	"query_text": "machine learning researcher",
	"metric": "cosine",
	"top_k": 3
}'