EVP demo for XOF digest using SHAKE256

This demo optionally accepts a single command line argument, allowing
the output length to be specified.

Fixes #14106.

Reviewed-b

EVP demo for XOF digest using SHAKE256

This demo optionally accepts a single command line argument, allowing
the output length to be specified.

Fixes #14106.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17803)

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Update the demos/README file because it is really old. New demos should provide best practice for API use.
Add demonstration for computing a SHA3-512 digest - digest/EVP_MD_demo

Reviewed

Update the demos/README file because it is really old. New demos should provide best practice for API use.
Add demonstration for computing a SHA3-512 digest - digest/EVP_MD_demo

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/14150)

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