Schedule sending of reward tokens to the node reward address

[Neylix]

Description

After the mint reward, we send to the node reward to all authorized nodes.

Fixes #382

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

node reward transaction is sent after the mint reward one, or if there is no mint reward transaction to do the node reward tx is directly sent.

Add test in test files.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules