Implement `--fast` tests in integration_tests

[certik]

For example this fails:

$ lpython -I$CONDA_PREFIX/lib/python3.11/site-packages/ test_package_01.py --fast
ASR verify pass error: ASR verify: FunctionCall::m_name `func` cannot point outside of its symbol table
Internal Compiler Error: Unhandled exception
Traceback (most recent call last):
 File "/Users/ondrej/repos/lpython/src/bin/lpython.cpp", line 1822
 err = compile_python_to_object_file(arg_file, tmp_o, runtime_library_dir,
 File "/Users/ondrej/repos/lpython/src/bin/lpython.cpp", line 809
 res = fe.get_llvm3(*asr, pass_manager, diagnostics, infile);
 File "/Users/ondrej/repos/lpython/src/lpython/python_evaluator.cpp", line 58
 run_fn, infile);
 File "/Users/ondrej/repos/lpython/src/libasr/codegen/asr_to_llvm.cpp", line 8062
 pass_manager.apply_passes(al, &asr, pass_options, diagnostics);
 File "/Users/ondrej/repos/lpython/src/libasr/pass/pass_manager.h", line 269
 _apply_passes(al, asr, _with_optimization_passes, pass_options,
 File "/Users/ondrej/repos/lpython/src/libasr/pass/pass_manager.h", line 148
 throw LCompilersException("Verify failed");
LCompilersException: Verify failed

[certik]

I think all the tests should run both --fast and no fast. Then some tests will fail, so for those we can introduce some label like NOFAST which will only run without --fast, for all the backends.