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Compute argon2id based secret from user email and password only. This uses Argon2id
for stretching a potentially weak user password/PIN and subsequent HKDF based key
extending to derive private key material (PKM) for different usage contexts.
The Argon2 parameters used are the following:
* kdf ``argon2id-13``
* time cost ``4096``
* memory cost ``512``
* parallelism ``1``
See `draft-irtf-cfrg-argon2 `__ and
`argon2-cffi `__.
:param email: User email.
:param password: User password.
:param salt: Optional salt to use (must be 16 bytes long). If none is given, compute salt
from email as ``salt = SHA256(email)[:16]``.
:return: The computed private key material (256b, 32 octets).
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Expand ``pkm`` and ``context`` into a key of length ``bytes`` using
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:param pkm:
:param context:
:param salt:
:return:
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