rust: factory: Add rros_release_element function

[yexuanyang]

Diff:

1. In factory.rs:
   • Change the field inside and dispose in struct RrosFactory.
   • Implement methods remove_element_device, is_public, __do_put_element, do_put_element_work, do_put_element_irq, do_put_element, put_element for RrosElement
   • Modify the code used inside, because type has changed from Option<RrosFactoryInside> to RrosFactoryInside.
   • Add function unbind_file_to_element
   • Add function rros_open_element and rros_release_element
2. In sub factory(proxy/buf/poll,etc. .rs): Change the static factory creation.
3. In device.rs: Implement unregister for Device
4. In type.rs: Implement hash_del for HlistNode

Status:

1. Compilation: Compile with clang-13.0.1 toolchain, ARCH=arm64, use rros_defconfig.
2. Functional test: Haven't started yet.

Related issue: resolving #47

[yexuanyang]

Status:

1. Compilation: Compile with clang-13.0.1 toolchain, ARCH=arm64, use rros_defconfig.

The compilation finishes with 13 warnings. All of them are about never used.