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1. Ports `FlutterTask` from groovy to kotlin
2. Refactors `BaseFlutterTask` a bit, to follow a paradigm that methods
on `BaseFlutterTask` and `FlutterTask` will contain no logic, and
instead be set equal to a method with the same name in
`BaseFlutterTaskHelper` and `FlutterTaskHelper` respectively, and that
both of those helpers will be stateless. This allows us to somewhat get
around the fact that you cannot create a `Task` instance in testing,
because testing the logic of the task is the same as testing the logic
of the helper.
3. Also creates a `FlutterPluginConstants` object to hold the constants
from `FlutterPlugin`. I think ideally this will be collapsed back in to
`FlutterPlugin` when the conversion is completed, but it needs to be
moved for now so it can be referenced in Kotlin code (this pr needs it).

Fixes flutter#162112

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

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---------

Co-authored-by: Gray Mackall <[email protected]>