Add debug endpoint and voice query parameters, update collection field schema, fix the prefix param 🐛, add support for node URL

[haydenhoang]

Change Summary

Included in #35

let node1 = Node(url: "http://localhost:8108") // or
let node2 = Node(host: "xxx-1.a1.typesense.net", port: "443", nodeProtocol: "https")

Fix the prefix parameter from

http://localhost:8108/multi_search?query_by=name&prefix=t,r,u,e,,,t,r,u,e

To

http://localhost:8108/multi_search?query_by=name&prefix=true,true

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