Revert "chore: move all node-api impl to ext (#24662)" (#24680)

This reverts commit d00fbd70258a77a267fe20bdd2c4a028c799b693.

Reverting because, it caused a failure during v1.45.3 publish:

https://github.com/denoland/deno/actions/runs/10048730693/job/27773718095

1 files changed, 0 insertions, 37 deletions

diff --git a/ext/napi/sym/README.md b/ext/napi/sym/README.md
deleted file mode 100644
index de08a8e17..000000000
--- a/ext/napi/sym/README.md
+++ /dev/null
@@ -1,37 +0,0 @@
-# napi_sym
-
-A proc_macro for Deno's Node-API implementation. It does the following things:
-
-- Marks the symbol as `#[no_mangle]` and rewrites it as `pub extern "C" $name`.
-- Asserts that the function symbol is present in
-  [`symbol_exports.json`](./symbol_exports.json).
-- Maps `deno_napi::Result` to raw `napi_result`.
-
-```rust
-use deno_napi::napi_value;
-use deno_napi::Env;
-use deno_napi::Error;
-use deno_napi::Result;
-
-#[napi_sym::napi_sym]
-fn napi_get_boolean(
-  env: *mut Env,
-  value: bool,
-  result: *mut napi_value,
-) -> Result {
-  let _env: &mut Env = env.as_mut().ok_or(Error::InvalidArg)?;
-  // *result = ...
-  Ok(())
-}
-```
-
-### `symbol_exports.json`
-
-A file containing the symbols that need to be put into the executable's dynamic
-symbol table at link-time.
-
-This is done using `/DEF:` on Windows, `-exported_symbol,_` on macOS and
-`--export-dynamic-symbol=` on Linux. See [`cli/build.rs`](../build.rs).
-
-On Windows, you need to generate the `.def` file by running
-[`tools/napi/generate_symbols_lists.js`](../../tools/napi/generate_symbols_lists.js).