UI refactore: HexView.js

[KWMORALE]

Your checklist for this pull request

• [x] I've read the contributing guideline.
• [ ] I've tested my changes by building and running the project, and testing changed functionality (if applicable)
• [ ] I've added automated tests for my change (if applicable, optional)
• [ ] I've updated documentation to reflect my change (if applicable)

What is the current behaviour?

Legacy class based component

What is the new behaviour?

Functional component based on react hooks

Test plan

Check hex view

[KWMORALE]

Totally check the references, before merge