Move the document trait into a separate crate (#3035)

* add a default head method through eval
* remove the old document trait
* implement document for each platform
* pull out document into a dedicated crate to cut down on shared dependencies
---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

examples/meta.rs

@@ -12,23 +12,23 @@ fn app() -> Element {
         // You can use the Meta component to render a meta tag into the head of the page
         // Meta tags are useful to provide information about the page to search engines and social media sites
         // This example sets up meta tags for the open graph protocol for social media previews
-        Meta {
+        document::Meta {
             property: "og:title",
             content: "My Site",
         }
-        Meta {
+        document::Meta {
             property: "og:type",
             content: "website",
         }
-        Meta {
+        document::Meta {
             property: "og:url",
             content: "https://www.example.com",
         }
-        Meta {
+        document::Meta {
             property: "og:image",
             content: "https://example.com/image.jpg",
         }
-        Meta {
+        document::Meta {
             name: "description",
             content: "My Site is a site",
         }