chore(deps): Updated Kotlin from version 1.7.0 to 1.8.20 and respective linter/formatter tool

[daniel-lopes-optimizely]

This PR upgrades:

• the Gradle version - the build files were rewritten in Kotlin for type safety
• the Kotlin version, from 1.7.x to 1.8.x
• the Kotlin coroutine library version, from release candidate to the latest stable version
• the code linting gradle plugin and ktlint version, which prompted a code reformat

Please have a look and let me know how I can further support this PR.

Developer Checklist ℹ️

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Appropriate docs were updated (if necessary)

Fixes #1277 🦕

[jkaster]

Thanks for this! Sorry for the update dance, but could you resolve the conflicts again and I'll get the CI run submitted and try the branch myself?

[daniel-lopes-optimizely]

Hello @jkaster I've resolved the conflicts, should be good to take look now.

[jeremytchang]

Created a pr with your changes/commit @daniel-lopes-optimizely to trigger our CI.