feat: prioritize protocol txs

[shifty11]

Summary by CodeRabbit

• New Features

  • Introduced a priority proposal handler to manage transaction prioritization for block proposals.

• Configuration Changes

  • Restructured funding details in the genesis section to specify denominations and adjust total funded values.

• Tests

  • Added comprehensive test cases for transaction handling and order verification in the proposal handler.
  • Updated test utilities for proposal handling and upgrade testing.
  • Modified denominations in reward and withdrawal reward tests to "zcoin" and "ycoin".

These updates enhance transaction management and improve the clarity and accuracy of funding configurations.