Remake the use of `Spell Checking` to extension point

[Danil42Russia]

https://github.com/VKCOM/modulite/blob/36b7c72e7f6769b37cffc7a9b8cbd737f695cf52/src/main/kotlin/com/vk/modulite/ModuliteStartupActivity.kt#L12

Start using com.intellij.spellchecker.support extension point. Docs: https://plugins.jetbrains.com/docs/intellij/spell-checking.html