[v12.x backport] repl: support --loader option in builtin REPL #35394
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Backport of #33437
First commit is a cherry-pick of 05539c1 with simple conflicts solved.
I added a fixup commit to avoid printing the experimental warning everytime the REPL is started. There is one difference with the current state of v12.x though: if we merge this, using dynamic import from within the REPL will no longer print the warning, because the ESM loader will already be initialized.
/cc @nodejs/modules