Add data platform toolbox

[katyalmohit]

Pull Request

Description

Add a page for data-platform toolbox. It manages organisations, users, locations and policies.

Fixes #389

How Has This Been Tested?

• tested locally and on development
• tested the UI with streamlit testing

Tests:

• Organisations: create, get, delete
• Users: create, get, delete, add/remove from organisations
• Locations: create, list, get
• Policies: create/get groups, add/remove location policies, add/remove groups to orgs

Checklist:

• My code follows OCF's coding style guidelines
• I have performed a self-review of my own code
• 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 my code and corrected any misspellings

[peterdudfield]

This looks really good, Ive left a few small comments for you to do.
And you mentioned to me that

1. move some repeat functions in tests to conftest.py
2. use

async with Channel(host=data_platform_host, port=data_platform_port) as channel:
     client = dp.DataPlatformDataServiceStub(channel)

in client, and you might have to move things to async

[peterdudfield]

small changes, and nearly there

[peterdudfield]

Good idea to update the readme.md with what this new directory does