Richard Levitte 70a1f7b4d7 Add evp_keymgmt_export_to_provider(), for key transfer between providers
This function is used to transport private key materia from whatever
is already attached to the EVP_PKEY to the new provider, using key
data export and import functionality.

If a legacy lower level key has been assigned to the EVP_PKEY, we use
its data to create a provider side key, and thereby have a bridge
between old style public key types and the EVP_PKEY on providers.

If successful, this function returns a reference to the appropriate
provider side data for the key.

This can be used by any operation that wants to use this key.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9312)
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