src: introduce DCHECK macro

This commit adds a DCHECK macro for consistency with the
other DCHECK_* macros.

PR-URL: https://github.com/nodejs/node/pull/25207


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>