feat(api): added isAuthenticated, currentNetwork and localCurrency to the nOS API

[DalderupMaurice]

Description

Adds

window.NOS.V1.getCurrentNetwork()
window.NOS.V1.getLocalCurrency()
window.NOS.V1.isAuthenticated()

to the nOS API

Also allowed the following API calls to be called without the need for the user to be signed in

  'isAuthenticated',
  'getStorage',
  'getLastBlock',
  'getCurrentNetwork',
  'getLocalCurrency'

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate)

Types of changes

• Chore (tests, refactors, and fixes)
• New feature (adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have read the CONTRIBUTING guidelines and confirm that my code follows the code style of this project.
• Tests for the changes have been added (for bug fixes/features)

Documentation

• Docs need to be added/updated (for bug fixes/features)

Closing issues

Fixes #870

[codecov]

Codecov Report

Merging #1187 into develop will decrease coverage by 0.33%.
The diff coverage is 20%.

@@            Coverage Diff             @@
##           develop   #1187      +/-   ##
==========================================
- Coverage    50.23%   49.9%   -0.34%     
==========================================
  Files          240     248       +8     
  Lines         2096    2120      +24     
  Branches       280     282       +2     
==========================================
+ Hits          1053    1058       +5     
- Misses         867     884      +17     
- Partials       176     178       +2