LL-248 Setup abstract classes/interfaces for frontend typescript logic

[aematei]

Description

Setup abstract classes/interfaces for frontend typescript logic

Subsequent # LL-248

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• 1) Will be using mock API https://jsonplaceholder.typicode.com/ for testing...

Checklist (when relevant):

• My code follows the style guidelines of this project
  TypeScript
  Schema
• I have included a reviewer on the pull request [Replace this text with the reviewer]
• 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

[aematei]

@pogi7 Can you help me out with something? I'm trying to use Zustand to make a hook to store state of a todo list for my example service. I'm getting an error in src/components/ExampleServicePage.tsx that I can't seem to figure out. I'm trying to bind my service API method service.getAll() to the refresh setter in my hook. Can you take a look when you have a chance? We can also tag up if you'd prefer.

Thanks!