Migrate Core Tests Into Respective Test Files

[stricklandrbls]

The ./core/src/tests/omega_test.cpp file is quite large and would benefit from extracting test procedures into separate test files, respective to the associative source file within ./core/src/lib/.

For example:
TEST_CASE("Encoding", "[EncodingTest]") would be extracted out to a test source file relating to the functionality within ./core/src/lib/encode.c.

[scholarsmate]

I'm in favor of this. That file is large and not very organized. It would be great to split it up into organized and manageable tests akin to what's been done for the mocha tests for the TypeScript client.