Add Sourcelink Tests and many cleanups

[TheAngryByrd]

Proposed Changes

This adds sourcelink test to the build process to ensure sourcelink is working correctly. I've also added a bunch of small tweaks I tend to do to projects after using miniscaffold and have incorporated them back.

Types of changes

What types of changes does your code introduce to Appium?
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• Bugfix (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)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• Build and tests pass locally
• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added necessary documentation (if appropriate)

Further comments

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