Apply scalings in api_get_record_matrix

[maxrjones]

Description of proposed changes

Similar to #5291, but for matrices. Unlike that PR, I did not do anything about checking whether GMT_IS_REFERENCE | GMT_IS_DUPLICATE is needed.

All GMT and PyGMT tests pass, except one which is wrong (xref GenericMappingTools/pygmt#1539). I did not test GMT.jl.

Addresses GenericMappingTools/pygmt#1313

Reminders

• Make sure that your code follows our style. Use the other functions/files as a basis.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Describe changes to function behavior and arguments in a comment below the function declaration.
• If adding new functionality, add a detailed description to the documentation and/or an example.

[joa-quim]

This is the type of things I keep saying we should avoid. If there is something to convert we should have a different for loop to deal with it, instead of adding more and more if conditions inside the same loop.

Not particular to this case, though.

[maxrjones]

This is the type of things I keep saying we should avoid. If there is something to convert we should have a different for loop to deal with it, instead of adding more and more if conditions inside the same loop.

Not particular to this case, though.

The code could be refactored separately, but in this PR I am simply fixing a bug using the current structure.