keys: Expose HD tooling
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ebuchman commented
We need to be able to recover private keys from the words written down in the fundraiser, which used HD (bip32). We already have the HD code under keys/hd but we don't expose it in any tooling.
We should have some way to specify an HD path when generating a secp256k1 key (note this only works for secp for now, not ed25519).
This is specifically to facilitate offline transactions, eg cosmos/cosmos-sdk#966