task_local context over context objects

- interner impls logically separate from API in orchid-base (default host interner still in base for testing)
- error reporting, logging, and a variety of other features passed down via context in extension, not yet in host to maintain library-ish profile, should consider options
- no global spawn mechanic, the host has a spawn function but extensions only get a stash for enqueuing async work in sync callbacks which is then explicitly, manually, and with strict order popped and awaited
- still deadlocks nondeterministically for some ungodly reason

orchid-std/src/main.rs

@@ -1,8 +1,8 @@
-use orchid_extension::entrypoint::ExtensionData;
+use orchid_extension::entrypoint::ExtensionBuilder;
 use orchid_extension::tokio::tokio_main;
 use orchid_std::{MacroSystem, StdSystem};
 
 #[tokio::main(flavor = "current_thread")]
 pub async fn main() {
-	tokio_main(ExtensionData::new("orchid-std::main", &[&StdSystem, &MacroSystem])).await
+	tokio_main(ExtensionBuilder::new("orchid-std::main").system(StdSystem).system(MacroSystem)).await
 }