Add OSAL library build, coverage test, and functional tests to CI

[skliper]

Is your feature request related to a problem? Please describe.
CI doesn't build or execute tests for OSAL

Related to conversation on #23

Describe the solution you'd like
Ideally create a Makefile with a set of rules to cover building, running tests, and reporting coverage (pattern after bundle build) which allows for users to easily do the same thing
Once created, put into CI

Additional Info
Some of the actions are detailed in https://github.com/nasa/cFS/blob/dev-vdd/VDD.md

Requester Info
Jacob Hageman - NASA/GSFC

[skliper]

Run/report functional (ENABLE_UNIT_TESTS set) test coverage (specific for OS)
Add standard host coverage tests (OSALCOVERAGE_TARGET_OSTYPE) that does everything, coverage-vxworks that does shared and vxworks, coverage-rtems, coverage-linux.

Matrix build with BUILDTYPE=release and debug, etc.