Adds Spotless configuration for Java

[haydenbaker]

Background

• Adds spotless configuration for java
  • Spotless will automatically format code after build
• Removes checkstyle
• Formats all files in the repository
• Adds a property, noFormat, to skip autoformatting
  • CI will not auto-format, but will still check and fail if code is not formatted

Testing

• ./gradlew clean build
• Build times before and after this change are the same, spotless will only run on changed files

Links

• Links to additional context, if necessary
• Issue #, if applicable (see here for a list of keywords to use for linking issues)

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.