feat(genesis): allows external genesis file

[jurajpiar]

Description

First checks for files inside the resources folder to provide default backward compatibility and if not found it tries the file system.

Motivation and Context

Needed for loading a custom genesis for pre-built image.

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• Tests for the changes have been added (for bug fixes / features)
• Requires Activation Code (Hard Fork)

• Other information: