Memory check (leaks and heap tracing) functions for unit tests
now have a separate file now and are renamed for more consistency.
BREAKING CHANGE: renamed memory check function names which may be used
in unit tests outside IDF.
New unity component can be used for testing other applications.
Upstream version of Unity is included as a submodule.
Utilities specific to ESP-IDF unit tests (partitions, leak checking
setup/teardown functions, etc) are kept only in unit-test-app.
Kconfig options are added to allow disabling certain Unity features.