Crypto: Enable Yes-Crypto at runtime using an environment variable

What

Enable yes-crypto using an environment vairable

Why

Currently we need to apply a patch and recompile to launch octez binaries using yes-cryptography. This is inefficient, in particular in scenarios involving yes nodes and non-yes nodes. Besides, having it applied by default will help develop automatic tests using yes crypto.

How

By using a TEZOS_USE_YES_CRYPTO_I_KNOW_WHAT_I_AM_DOING environment variable.

To further protect against a misuage of this environment variable, nodes must also explicitely allow yes crypto by using the new argument --allow-yes-crypto.

Manually testing the MR

dune exec tezt/tests/main.exe -- --file yes_crypto.ml

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR