Restructure all http related files

Moving all http related functions and helpers into a new http submodule

http/context.go

@@ -0,0 +1,19 @@
+package http
+
+import (
+	"context"
+	"net/http"
+)
+
+func ContextValsMiddleware(pairs map[any]any) HandlerBuilder {
+	return func(h http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			ctx := r.Context()
+			for key, val := range pairs {
+				ctx = context.WithValue(ctx, key, val)
+			}
+			newRequest := r.WithContext(ctx)
+			h.ServeHTTP(w, newRequest)
+		})
+	}
+}