Setup detekt static analysis plugin

[fractalwrench]

Goal

Detekt is a static analysis program for Kotlin that is pretty commonly used on Android. I've set it up on any module that is using the Android library conventions gradle script as I think it'd be beneficial for catching potential problems and maintaining consistent formatting style in Kotlin code.

Analysis can be triggered via ./gradlew detekt or ./gradlew check. I've suppressed all existing warnings in the project by using a baseline file, and any subsequent warnings would fail the build. The baseline can be added to by ./gradlew detektBaseline which will regenerate the file.

If any of the default rules in the baseline seem annoying or too much of a false positive I'm pretty happy to update the PR, as specific rules can be configured or even disabled. I went with as close to the default as possible, but FWIW here are the modifications we found useful at Embrace: https://github.com/embrace-io/embrace-android-sdk/blob/main/config/detekt/detekt.yml

[LikeTheSalad]

I left a couple of comments, though I like the overall idea as it can provide similar benefits we get with errorprone, but for Kotlin. I'm not yet aware if this config is "too strict" or not, as I haven't worked with it yet, although I guess we can make adjustments later if needed. Thank you!

[breedx-splk]

Thanks for the addition. One small downside I notice is the sudden appearance of a lot of xml in this project. :)

[bidetofevil]

The idea is that we should fix or configure the ruleset so there are no XML files, but I'd take those rather than have the issues that those bring up.

Disabling rules that we don't care about enough to fix is always a good option