Do not export private symbols(symbols not declared in public headers)

[lplewa]

Current State:

We are currently exporting symbols that are not declared in public headers. These symbols are listed in map/def files and seem to be exported primarily for use in tests when UMF is compiled as a shared library.

Identified Issue:

A specific instance of this problem was addressed in issue #564, but it is likely that there are additional symbols improperly exported.

Tasks Before Major Release:

• Review Exported Functions:
  Conduct a comprehensive audit of all symbols currently exported in the project.
  Verify whether each exported symbol should be publicly available or if they were exported inadvertently.