Hotreloading of for/if/body, formatted strings, literals, component props, nested rsx, light CLI rewrite, cli TUI (#2258)

Hotreload the contents of for loops, if chains, component bodies, props, attributes, and any literals discovered in rsx!
Add a TUI renderer to the CLI.
Improve the CLI build system to be async and parallel.
Refactor RSX to allow partial expansion of expressions.
Merge autofmt implementations for consistency.
Merge the representation of elements and components under the hood.
Add a diagnostics system for rsx for improved error messages.
Drop interprocess and move to websockets for communication between the CLI and the server.
Assign IDs to nodes and attributes in a stable way to be used in non compiler contexts.
Add hotreloading to any body of component/for loop/if chain/etc.

---------

Co-authored-by: Evan Almloff <evanalmloff@gmail.com>
Co-authored-by: Liam Mitchell <liamkarlmitchell@gmail.com>

packages/cli/src/metadata.rs

@@ -0,0 +1,64 @@
+//! Utilities for working with cargo and rust files
+use std::error::Error;
+use std::{
+    env,
+    fmt::{Display, Formatter},
+    fs,
+    path::{Path, PathBuf},
+};
+
+#[derive(Debug, Clone)]
+pub struct CargoError {
+    msg: String,
+}
+
+impl CargoError {
+    pub fn new(msg: String) -> Self {
+        Self { msg }
+    }
+}
+
+impl Display for CargoError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "CargoError: {}", self.msg)
+    }
+}
+
+impl Error for CargoError {}
+
+/// How many parent folders are searched for a `Cargo.toml`
+const MAX_ANCESTORS: u32 = 10;
+
+/// Returns the root of the crate that the command is run from
+///
+/// If the command is run from the workspace root, this will return the top-level Cargo.toml
+pub(crate) fn crate_root() -> Result<PathBuf, CargoError> {
+    // From the current directory we work our way up, looking for `Cargo.toml`
+    env::current_dir()
+        .ok()
+        .and_then(|mut wd| {
+            for _ in 0..MAX_ANCESTORS {
+                if contains_manifest(&wd) {
+                    return Some(wd);
+                }
+                if !wd.pop() {
+                    break;
+                }
+            }
+            None
+        })
+        .ok_or_else(|| {
+            CargoError::new("Failed to find directory containing Cargo.toml".to_string())
+        })
+}
+
+/// Checks if the directory contains `Cargo.toml`
+fn contains_manifest(path: &Path) -> bool {
+    fs::read_dir(path)
+        .map(|entries| {
+            entries
+                .filter_map(Result::ok)
+                .any(|ent| &ent.file_name() == "Cargo.toml")
+        })
+        .unwrap_or(false)
+}