add verbosity param for getblock

[tyler-nguyen]

getblock has a second param verbosity.

https://developer.bitcoin.org/reference/rpc/getblock.html

getblock "blockhash" ( verbosity )

If verbosity is 0, returns a string that is serialized, hex-encoded data for block ‘hash’.

If verbosity is 1, returns an Object with information about block ‘hash’.

If verbosity is 2, returns an Object with information about block ‘hash’ and information about each transaction.