creationBytes as POST body

[ohager]

Is your feature request related to a problem? Please describe.
Smart Contracts byte code is attached as URL parameter. URL length is limited (not even have the same limit on difference browsers) and complex contracts may not be publishable using SignumJS. The Signum Node supports to receive a contracts creation byte sequence as body.

Describe the solution you'd like
Mount the creation byte sequence and attach as body instead of sending as URL parameters

The creation byte sequence has to be mounted as depicted in SignumJ

https://github.com/signum-network/signumj/blob/45c0528df866b2f331606a6ca52771b8d2aea955/src/main/java/signumj/crypto/SignumCryptoImpl.java#L472

Describe alternatives you've considered
There's no alternative

[deleterium]

Maybe I can help, tell me were to do. I already did a parse for creation bytes here

https://github.com/deleterium/smartc-signum-decompiler/blob/d041a52fa8989d0c132a741e9660deb98a0f1464/src/index.ts#L311

Works for at version 3.