feat: integrate serialization and string borrowing

This commit adds lifetimes to the diff and realdom methods so consumers may borrow the contents of the DOM for serialization or asynchronous modifications.

Cargo.toml

@@ -56,6 +56,7 @@ members = [
     "packages/core",
     "packages/html-namespace",
     "packages/web",
+    "packages/webview"
     # "packages/cli",
     # "packages/atoms",
     # "packages/ssr",