Previously, the `require()` function exposed to the embedded SEA code
was calling the internal `require()` function if the module name
belonged to the list of public core modules but the internal `require()`
function does not support loading modules with the "node:" prefix, so
this change forwards the calls to another `require()` function that
supports this.

Fixes: nodejs/single-executable#69
Signed-off-by: Darshan Sen <raisinten@gmail.com>

…e with the SEA require

Previously, this code:
```sh
node --snapshot-blob snapshot.blob --build-snapshot <(echo "require('node:test')")`
```
was failing with a "Error: Cannot find module 'node:test'." error, so
this change fixes that and uses the same code path for normalizing ids
for both the snapshot require function as well as the SEA require
function.

However, building a snapshot when `node:test` is required now fails with:
```sh
./node --snapshot-blob snapshot.blob --build-snapshot <(echo "require('node:test')")
(node:5362) Warning: built-in module node:test is not yet supported in user snapshots
(Use `node --trace-warnings ...` to show where the warning was created)
Unknown external reference 0x10201dd70.
<unresolved>
[1]    5362 trace trap  ./node --snapshot-blob snapshot.blob --build-snapshot
```
which could be solved in a separate PR.

Refs: nodejs#47779 (comment)
Signed-off-by: Darshan Sen <raisinten@gmail.com>