Add delegate resource method

[Wawilow]

I've added delegate resource method, all thanks to Max.
Method documentation: https://developers.tron.network/reference/delegateresource-1

PS: You'll probably better to merge the commits

[Wawilow]

Thank's @shaksi for adding UndelegateResource and Getdelegatedresource functions

I'm really looking forward for merging this request to the main branch

@iexbase let me now if you need something else

[Wawilow]

@serderovsh Hey, I've closed a few issues in this pull-request, can you please take a look and give feedback on what else needs to be done to get it into the main repository?

Thank you up front!

[tooruu]

Can't you tell this project is dead? At least use Fenguoz's fork.

[Wawilow]

Mantainer is still active, but tbh I don't really care, I anyway got my own fork