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MCSAT: Preprocessor: fix equality simplification for mixed real-integer terms (#481)

It is wrong to remove integer variable by substituting a real variable.
This was happening in the mcsat preprocessor during equality propagation of the top-level equality x_int_var = y_real_var.
This PR fixes this issue by not doing propagation of such equalities.

This PR:

Fixes mcsat preprocessor
Adds regression tests
Adds api test

* don't propagate top-level equality if the types of lhs and rhs are not the same

* add regression tests

* api test

* fix corner case of ARITH_EQ_TERM in detecting is_mixed

* update test

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