Support configuration through environment variable

[Jakuje]

This is rough PoC of allowing the kryoptic to work without the pReserved pointer and without the init args altogether (as they are not mandatory). The code can probably be simplified, but this worked for me and allowed me to run the general pkcs11 applications against kryoptic without issues.

[simo5]

Should we add a default place to look at when no env var is set ? (perhaps in a separate PR)

[simo5]

Thanks!