feat(routing): add api to access key segments by name

src/http/lnm_http_router.c

@@ -268,3 +268,30 @@ lnm_http_route_err lnm_http_router_route(lnm_http_route_match *out,
 
   return __lnm_http_router_route(out, router, method, path, 0, 0);
 }
+
+lnm_err lnm_http_route_match_get(lnm_http_route_match_segment **out,
+                                 lnm_http_route_match *match, const char *key) {
+  if (match->route->key_segments == NULL) {
+    return lnm_err_not_found;
+  }
+
+  lnm_http_route_segment_trie *trie = match->route->key_segments;
+
+  while (*key != '\0') {
+    trie = trie->children[(unsigned char)*key];
+
+    if (trie == NULL) {
+      return lnm_err_not_found;
+    }
+
+    key++;
+  }
+
+  if (!trie->represents_segment) {
+    return lnm_err_not_found;
+  }
+
+  *out = &match->key_segments[trie->index];
+
+  return lnm_err_ok;
+}