Add Ascend installation adapter

[zhabuye]

Motivation

I hope lmdeploy can be installed directly from source in the Ascend environment, and I have made adaptation modifications for this.

Modification

I have added requirements_ascend and requirements/runtime_ascend.txt compatible with Ascend and included corresponding conditional branches in setup.py so that users can achieve one-click installation in the Ascend environment.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit tests to ensure the correctness.
3. If the modification has a dependency on downstream projects of a newer version, this PR should be tested with all supported versions of downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

Thank you for your approval!