test: simplify and document the output format for the Scheme test framework.
test: add stub Scheme test group to be tested from JS.
test: test the Scheme test framework from JS.
test: inline unit-test-negative.scm into unit-test.scm.
test: move test/framework/unit-test-test.scm => test/unit-test-tests.scm.
test: move test/framework/unit-test.scm to test/.
test: basic support for pretty-printing the Scheme test group name.
test: pretty-print all Scheme-based unit tests.
test: log a failure record when a Scheme unit test fails.