test/test-lib/init/strict-import-as-require.lua: add import as require for test

Signed-off-by: Vladimir Stebunov <vstebunov@gmail.com>
test/cases/04*-code-foreign-globals-*: added test for missing _PROMPTs

Signed-off-by: Vladimir Stebunov <vstebunov@gmail.com>
test/low-level/0150-strict.lua: _PROMPTs added
lua-nucleo/strict.lua: added _PROMPT declares for interactive mode

Signed-off by Vladimir Stebunov <vstebunov@gmail.com>