feat(types): add missing INX model wrappers

[Alex6323]

Description of change

This PR:

• updates bee-inx with the latest INX models by providing convenience wrappers
• refactors parts of this crate to make them easier to understand and more consistent

Links to any relevant issues

Type of change

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

How the change has been tested

Change checklist

• 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
• I have updated the CHANGELOG.md, if my changes are significant enough

[grtlr]

I'm waiting for the changes to the Bee repo before I review and merge.