Feat: massive changes to definition of components

This change switches back to the original `ctx<props>` syntax for
commponents. This lets lifetime elision to remove the need to match
exactly which lifetime (props or ctx) gets  carried to the output. As
such, `Props` is currently required to be static. It *is* possible to
loosen this restriction, and will be done in the future, though only
through adding metadata about the props through the Props derive
macro. Implementing the IS_STATIC trait is unsafe, so the derive macro
will do it through some heuristics.

For now, this unlocks sharing vnodes from parents to children, enabling
pass-thru components, fragments, portals, etc.

packages/core/examples/macro_testing.rs

@@ -43,7 +43,7 @@ mod baller {
     use super::*;
     pub struct BallerProps {}
 
-    pub fn Baller(ctx: Context, props: &()) -> DomTree {
+    pub fn Baller(ctx: Context<()>) -> VNode {
         todo!()
     }
 }
@@ -53,7 +53,7 @@ pub struct TallerProps {
     a: &'static str,
 }
 
-pub fn Taller(ctx: Context, props: &TallerProps) -> DomTree {
+pub fn Taller(ctx: Context<TallerProps>) -> VNode {
     let b = true;
     todo!()
 }