Frank Denis a7122b7323
std.crypto: add constant-time codecs (#23420)
std.crypto: add constant-time codecs

Add constant-time hex/base64 codecs designed to process cryptographic
secrets, adapted from libsodium's implementations.

Introduce a `crypto.codecs` namespace for crypto-related encoders and
decoders. Move ASN.1 codecs to this namespace.

This will also naturally accommodate the proposed PEM codecs.
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