Expose Address payload and network properties

[notmandatory]

Description

Fixes #319

Notes to the reviewers

The test data was generated with:

bitcoin-cli -rpcwallet="regtest2" -datadir=/tmp/regtest1/bitcoind -regtest validateaddress "bcrt1qqjn9gky9mkrm3c28e5e87t5akd3twg6xezp0tv"
{
  "isvalid": true,
  "address": "bcrt1qqjn9gky9mkrm3c28e5e87t5akd3twg6xezp0tv",
  "scriptPubKey": "001404a6545885dd87b8e147cd327f2e9db362b72346",
  "isscript": false,
  "iswitness": true,
  "witness_version": 0,
  "witness_program": "04a6545885dd87b8e147cd327f2e9db362b72346"
}

Changelog notice

Added

• Expose Address payload and network properties.

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I ran cargo fmt and cargo clippy before committing

New Features:

• I've added tests for the new feature
• I've added docs for the new feature

[thunderbiscuit]

Reading this I think you might be able to kill two issues with one PR: see my comment on #267. I was about to add it to my PR #307 but I think it's a perfect fit for this one instead.

This would be the required method to add: https://docs.rs/bitcoin/0.29.2/bitcoin/util/address/struct.Address.html#method.from_script

[thunderbiscuit]

ACK cd10c75.