Fix property names [SDK-3507]

[Widcket]

⚠️ This PR contains breaking changes

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

📋 Changes

This PR renames the following properties to comply with Dart's API guidelines:

• UserProfile.profileURL to UserProfile.profileUrl
• UserProfile.pictureURL to UserProfile.pictureUrl
• UserProfile.websiteURL to UserProfile.websiteUrl
• ApiException.isInvalidAuthorizeURL to ApiException.isInvalidAuthorizeUrl
• ApiException.isPKCENotAvailable to ApiException.isPkceNotAvailable

Also, WebAuthException was renamed to WebAuthenticationException to be consistent with both the webAuthentication() method and WebAuthentication class.

[codecov]

Codecov Report

Merging #146 (5ddada4) into ga (5723fe5) will decrease coverage by 0.07%.
The diff coverage is 91.66%.

@@             Coverage Diff              @@
##                 ga     #146      +/-   ##
============================================
- Coverage     98.18%   98.11%   -0.08%     
  Complexity       75       75              
============================================
  Files            75       75              
  Lines          1378     1379       +1     
  Branches        296      296              
============================================
  Hits           1353     1353              
- Misses           13       14       +1     
  Partials         12       12              

Flag	Coverage Δ
auth0_flutter	100.00% <ø> (ø)
auth0_flutter_android	96.52% <ø> (ø)
auth0_flutter_ios	100.00% <ø> (ø)
auth0_flutter_platform_interface	96.30% <91.66%> (-0.36%)	⬇️

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)
...lib/src/web-auth/web_authentication_exception.dart	83.33% <83.33%> (ø)
...platform_interface/lib/src/auth/api_exception.dart	100.00% <100.00%> (ø)
...lib/src/method_channel_auth0_flutter_web_auth.dart	100.00% <100.00%> (ø)
...utter_platform_interface/lib/src/user_profile.dart	100.00% <100.00%> (ø)

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