Parser changes to handle MatMulIntegerToFloat

[TedThemistokleous]

Changes to MatMul parser to handle the Microsoft Contrib operator MatMulintegarToFloat

Since we have the scale and zero points in our operands we can just perform a multiplied after int8 biases are added and then insert a regular dot on the scaled input values which should give the same output as the input data types.

Able to leverage the existing set of tests for matmul