[FunC] Enrich and refactor testing framework, add negative tests

* fully refactor run_tests.py, make it extensible for the future
* an ability to write @compilation_should_fail tests
* an ability to launch run_tests.py for a single .fc file
* keep run_tests.js in sync with run_tests.py
* extract legacy_tests names/hashes to a separate file
  shared between legacy_tester.py and legacy_tester.js

crypto/func/auto-tests/tests/invalid.fc

@@ -0,0 +1,8 @@
+_ main(s) {
+  var (z, t) = ;
+
+{-
+@compilation_should_fail
+@stderr identifier expected instead of `;`
+@stderr var (z, t) = ;
+-}