Support additional properties for SDK client

[stevehobbsdev]

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

Note
Tests to follow as part of a different PR.

📋 Changes

This PR adds remaining properties for Auth0Client and AuthorizationParams in the JS interop for the underlying SPA client, and surfacing them up to the Dart code. It contains a few notable omissions:

• Does not support custom cache setting
• Does not (yet) support sending custom params, will follow in another PR

🎯 Testing

Tested manually, unit tests to follow.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.26 ⚠️

Comparison is base (ee90d58) 97.50% compared to head (e08d11f) 97.24%.

❗ Current head e08d11f differs from pull request most recent head 32795a8. Consider uploading reports for the commit 32795a8 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               beta     #211      +/-   ##
============================================
- Coverage     97.50%   97.24%   -0.26%     
  Complexity       82       82              
============================================
  Files            86       88       +2     
  Lines          1520     1524       +4     
  Branches        320      320              
============================================
  Hits           1482     1482              
- Misses           26       30       +4     
  Partials         12       12              

Flag	Coverage Δ
auth0_flutter	100.00% <ø> (ø)
auth0_flutter_android	96.60% <ø> (ø)
auth0_flutter_ios	100.00% <ø> (ø)
auth0_flutter_platform_interface	91.63% <0.00%> (-1.20%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
auth0_flutter/lib/auth0_flutter.dart	100.00% <ø> (ø)
..._interface/lib/src/auth0_flutter_web_platform.dart	0.00% <0.00%> (ø)
...platform_interface/lib/src/web/cache_location.dart	0.00% <0.00%> (ø)
...platform_interface/lib/src/web/client_options.dart	0.00% <0.00%> (ø)

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[Widcket]

I've corrected minor issues in the API docs.

[stevehobbsdev]

@Widcket Thanks for all the docs tweaks! Ready to re-review 👍🏻