FMS2_io: domain_read fix for z axis reads

[uramirez8707]

Description
Modifies code so that the edge lengths and corners are used correctly by fms2_io in domain read
Adds a test to verify the bug and confirm the fix

Fixes #1611

How Has This Been Tested?
CI including new tests

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes