OAWebView Initializer

[codefiesta]

Description

Fixes #70

The OAWebView is now being explicitly initialized with an OAuth object. This change is intended to do the following:

• Increase test code coverage
• Reduce potential bugs and developer confusion over the magic of which OAuth configuration is being used inside the OAWebView.

⚠️ This is a breaking change that forces developers to change the following:

 WindowGroup(id: "oauth") {
    OAWebView()
}

to

 WindowGroup(id: "oauth") {
    OAWebView(oauth: oauth)
}

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my 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