Add custom lint checks

[romtsn]

Description

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 #1806

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

[markushi]

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