Test for guess_type with inchikey in CompoundIdentifier class

[Ajoke23]

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• Have you followed the guidelines in our Contribution Guide
• Have you written new tests for your core changes, as applicable?
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Description

Create a test case to test for a valid inckikey.

Changes to be made

To add a guess type method in the CompoundIdentifier class to correctly identify valid inChikey.

Status

• Define a test function named test_guess_type_with_inchikey
• Set a valid inchikey
• Called a guess_type method
• Assert the result

To do

Test the code locally

Related to #1319