updated check_cell_measures
updated check_cell_measures

This is in reference to [issue #953](https://github.com/ioos/compliance-checker/issues/953)

Updated the function "check_cell_measures" to include:
- [ ] A measure variable must have units that are consistent with the measure type, i.e., square meters for area measures and cubic meters for volume measures.
ioos/compliance-checker,aodn/compliance-checker