eq() argument matcher does not support for value class type arguments

[m-koops]

Observed with version 6.1.0

When verifying a function call on a mock with a value class type argument, the eq() argument matcher does not match.
This is demonstrated with the following test:

    @Test
    fun eq_forValueClass() {
        val valueClass = ValueClass("Content")
        mock<Methods>().apply {
            valueClass(valueClass)
            verify(this).valueClass(eq(valueClass))
        }
    }

This test fails with the message:

Argument(s) are different! Wanted:
methods.valueClass-T-UsNSA(
    ValueClass(content=Content)
);
-> at test.MatchersTest.eq_forValueClass(MatchersTest.kt:354)
Actual invocations have different arguments:
methods.valueClass-T-UsNSA(
    "Content"
);
-> at test.MatchersTest.eq_forValueClass(MatchersTest.kt:353)

In extend to #522, the MR that added value class support to the any() and anyOrNull() implementations, also eq() should be enhanced to support value class arguments.