refactor(visit): Pre-generate visitor code (#9262)

**Description:**

This would improve compile time by a margin, and this is a refactoring that should be done before applying `swc_allocator::boxed::Box` to ES AST.

This PR removes `swc_visit_macros` because we now use a simple binary to generate code before publishing.


**Related issue:**

 - Closes #9101

.cargo/config.toml

@@ -1,5 +1,6 @@
 [alias]
-xtask = "run --package xtask --"
+codegen = "run --package generate-code --"
+xtask   = "run --package xtask --"
 
 [build]
 

Cargo.toml

@@ -26,12 +26,15 @@ members = [
   "crates/swc_transform_common",
   "crates/swc_typescript",
   "crates/swc_fast_ts_strip",
+  "tools/generate-code",
 ]
 resolver = "2"
 
   [workspace.package]
+  license    = "Apache-2.0"
   repository = "https://github.com/swc-project/swc.git"
 
+
   [workspace.dependencies]
   # bytecheck version should be in sync with rkyv version. Do not bump individually.
   bytecheck = "0.6.10"