feat(jans-cedarling): add WASM bindings for Cedarling

[rmarinn]

Feature Request: WASM Bindings for Cedarling

Is your feature request related to a problem? Please describe.

This feature request focuses on implementing WebAssembly (WASM) bindings for the Cedarling project, allowing it to run in a web environment.

Describe the solution you'd like

The following steps are necessary to be able to compile Cedarling to WASM:

• Replace the uuid7 crate with uuid configured with the js feature enabled for better WASM compatibility.
• Refactor to use reqwest::Client in place of reqwest::blocking::Client to avoid blocking I/O calls.
• Make Cedarling::authz asynchronous to support non-blocking initialization.
• Implement lazy loading for JWKS fetching to allow non-async initialization and improve startup efficiency in WASM environments.
• Include usage examples to demonstrate Cedarling’s WASM API in a browser environment.