Enable runtime updates of vector_store_uri configuration without
requiring server restart.
This allows to dynamically enable, disable, or switch the vector search service endpoint on the fly.
To improve the clarity the seastar::experimental::http::client is now wrapped in a private http_client class that also holds the host, address, and port information.
Tests have been added to verify that the client correctly handles transitions between enabled/disabled states and successfully switches traffic to a new endpoint after a configuration update.
Closes: VECTOR-102
No backport is needed as this is a new feature.
Closesscylladb/scylladb#25208
* github.com:scylladb/scylladb:
service/vector_store_client: Add live configuration update support
test/boost/vector_store_client_test.cc: Refactor vector store client test
service/vector_store_client: Refactor host_port struct created
service/vector_store_client: Refactor HTTP request creation
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