Fix: send evm example

[Tuditi]

Description of change

Adds an example for signing and sending EVM transactions using Stronghold.

Links to any relevant issues

closes: #592

Type of change

Choose a type of change, and delete any options that are not relevant.

• Enhancement (a non-breaking change which adds functionality)

How the change has been tested

I ran the examples.

Make sure to provide instructions for the maintainer as well as any relevant configurations.

Change checklist

Tick the boxes that are relevant to your changes, and delete any items that are not.

• I have followed the contribution guidelines for 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
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

[thibault-martinez]

CI is failing