feat: Implement WebFinger discovery and ActivityPub user actor endpoint

- Added a new router for handling well-known endpoints, specifically WebFinger.
- Implemented the `webfinger` function to respond to WebFinger queries.
- Created a new route for WebFinger in the router.
- Refactored user retrieval logic to support both user ID and username in a single endpoint.
- Updated user router to use the new `get_user_by_param` function.
- Added tests for WebFinger discovery and ActivityPub user actor endpoint.
- Updated dependencies in Cargo.toml files to include necessary libraries.

thoughts-backend/utils/src/testing/api/mod.rs

@@ -1,4 +1,9 @@
-use axum::{body::Body, http::Request, response::Response, Router};
+use axum::{
+    body::Body,
+    http::{header, Request},
+    response::Response,
+    Router,
+};
 use tower::ServiceExt;
 
 pub async fn make_get_request(app: Router, url: &str, user_id: Option<i32>) -> Response {
@@ -68,3 +73,25 @@ pub async fn make_jwt_request(
         .await
         .unwrap()
 }
+
+pub async fn make_request_with_headers(
+    app: Router,
+    url: &str,
+    method: &str,
+    body: Option<String>,
+    headers: Vec<(header::HeaderName, &str)>,
+) -> Response {
+    let mut builder = Request::builder()
+        .method(method)
+        .uri(url)
+        .header("Content-Type", "application/json");
+
+    for (key, value) in headers {
+        builder = builder.header(key, value);
+    }
+
+    let request_body = body.unwrap_or_default();
+    app.oneshot(builder.body(Body::from(request_body)).unwrap())
+        .await
+        .unwrap()
+}

thoughts-backend/utils/src/testing/mod.rs

@@ -1,5 +1,8 @@
 mod api;
 mod db;
 
-pub use api::{make_delete_request, make_get_request, make_jwt_request, make_post_request};
+pub use api::{
+    make_delete_request, make_get_request, make_jwt_request, make_post_request,
+    make_request_with_headers,
+};
 pub use db::setup_test_db;