Missing conversion of hash key in EqualsNode

[JaroslavTulach]

Pull Request Description

Expanding ValuesGenerator to cover also hosted Java maps (to cover #6682 issues) made me realize the HashCodeTest and EqualsTest are failing to convert keys to supported Enso values.

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• All code follows the
  Java,
  style guides.
• All code has been tested:
  • Unit tests have been written where possible.

[JaroslavTulach]

Without the EqualsComplexNode fix there were following faluires:

sbt:runtime> testOnly *HashCodeTest
[error] Test org.enso.interpreter.test.HashCodeTest.hashCodeContractTheory failed: hashCodeContractTheory("JavaObject[{A=1} (java.util.Collections$SingletonMap)]" <from unwrappedValues[63]>, "{1=1}" <from unwrappedValues[51]>), took 0.817 sec
[error] Failed: Total 3, Failed 1, Errors 0, Passed 2

sbt:runtime> testOnly *EqualsTest
[error] Test org.enso.interpreter.test.EqualsTest.equalsOperatorShouldBeSymmetric failed: equalsOperatorShouldBeSymmetric("{1=1}" <from unwrappedValues[51]>, "JavaObject[{A=1} (java.util.Collections$SingletonMap)]" <from unwrappedValues[63]>), took 0.453 sec
[error] Test org.enso.interpreter.test.EqualsTest.equalsNodeCachedIsConsistentWithUncached failed: equalsNodeCachedIsConsistentWithUncached("JavaObject[{A=1} (java.util.Collections$SingletonMap)]" <from unwrappedValues[63]>, "{1=1}" <from unwrappedValues[51]>), took 0.392 sec
[error] Failed: Total 7, Failed 2, Errors 0, Passed 5

these are fixed by converting key to Enso value.