Add custom lint checks

@nonnull

From the top of my head we could automatically detect the following potential problem that we point out in the PRs all the time:

Using withScope instead of configureScope
Adding final keywords everywhere (parameters, properties, etc.)
Adding @Nullable/@nonnull annotation everywhere (parameters, properties, etc.)
Catching Throwable instead of Exception, see Replace SDKs catch (Exception e) to catch (Throwable e) #1806

There's probably more, so keep updating this issue when you got something in mind.

Let's have a look how much of an effort this is (e.g. using checkstyle for finals, using ? for NotNull/Nullable)

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