Timber lint check warns on compile time constants

Given this code:

```
Timber.e("this is a really not multiline string"
+ "broken up for clarity")
```

_Actual_
Lint warns about using Timber's built in formatting.

_Desired_
Lint should not warn on compile time constants.

Start by locating the lint check responsible for Timber's built-in formatting warning and reproduce the issue with the compile-time string concatenation shown here. Add a regression test for that example and verify that the warning is no longer emitted while non-constant formatting cases retain their existing behavior.

Written by the indexing model from the issue text.