Peg-out to any address

[john-light]

With RSKIP-170, implemented in the Iris hard fork, it is now possible to peg-in to any address. However, on the peg-out side, users can still only peg-out to the P2PKH bitcoin address that is derived from the Rootstock address that made the peg-out request. This poses an inconvenience to users, and is also somewhat detrimental to privacy as it forces address re-use.

I propose that Rootstock enables peg-outs to any bitcoin address, ideally in all of the widely-used legacy and modern formats (P2PKH, P2SH, P2WPKH, P2WSH, and P2TR -- excluding P2PK since no one uses this).