claimScriptToP2PKHScript() is not exported

[Janaka-Steph]

It seems that tsdx doesn't really support multiple exports in index file.
See jaredpalmer/tsdx#367

[tiero]

right, since we have already Pegin class being the default.

Would make this method maybe a static one of the Pegin class? Can you do it @Janaka-Steph