buffer: buffer.transcode to use internal/errors

`buffer.transcode` is still using raw TypeError. This change is to
convert it to use internal/errors.

Ref: https://github.com/nodejs/node/issues/11273
PR-URL: https://github.com/nodejs/node/pull/16352


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>