[Feature] CanDB HTTP Support

[ByronBecker]

Motivation

Many languages don't have an IC agent client, but have already-existing HTTP client libraries and tooling. Additionally, most developers are already accustomed to using HTTP. Adding HTTP support makes CanDB easier to use and more accessible to Motoko developers.

Requirements

• Add HTTP compatible modules to candb-client-typescript (instead of using @Agent-JS)
• Re-write the hello-candb example or add a new CanDB example that uses HTTP
• Re-write the index canister APIs using HTTP
• Re-write the helloservice canister APIs using HTTP
• Add HTTP options to the candb-quickstart-template
• Provide documentation for using HTTP with CanDB