crypto/hsm/thales/xprvseeclient: new package
crypto/hsm/thales/xprvseeclient: new package

This directory contains a Java package to communicate
with xprvseemodule, which runs inside a Thales HSM.

The implementation here is a minimal stub to demonstrate
basic interaction with the module. In the future, we'll
add code to cover its true purpose. Planned functions:
	- root key generation
	- key derivation
	- signing

See https://chainhq.slack.com/files/kr/F0KC1FZBN/HSM_SEE_HD_KDF.

Closes chain/chainprv#613.
Reviewers: fc5595b96522dabbdb29adf930565dc0af1e9acd@bobg

chain/chain,chain/chain,chain/chain,chain/chain,chain/chain,chain/chain