Usage of standard type names in generics should be prohibited

[orchestr7]

Quite confusing, isn't it?

    fun<Int> foo(a: Int) {
    }

Need to prohibit naming of generic types with standard Kotlin types (kotlin.kotlin_builtins)

[nulls]

There is a common suggestion to use a single letter for generic types (for example in java Generic Types -> Type Parameter Naming Conventions, or sonar: squid:S00119). We can add similar rule to diktat

[petertrr]

use a single letter for generic types

We actually have this logic in diktat, described here