Add in Array, fix most of IR

HalideIR

python/tvm/__init__.py

python/tvm/_ctypes/_api.py

python/tvm/domain.py

python/tvm/expr.py

python/tvm/function.py

python/tvm/stmt.py

src/c_api/c_api_function.cc

src/c_api/c_api_ir.cc

src/c_api/c_api_registry.h

tests/python/test_basic.py