Add ucclEP wrapper

[CalebZ9909]

Description

Please include a summary of the changes and the related issue.

Fixes # (issue)

Type of Change

• Bug fix
• New feature
• Documentation update

How Has This Been Tested?

Include any tests here.

• Unit tests
• Integration tests
• Manual testing

Checklist

• My code follows the style guidelines, e.g. format.sh.
• I have run build_and_install.sh to verify compilation.
• I have removed redundant variables and comments.
• I have updated the documentation.
• I have added tests.

[YangZhou1997]

Is this supposed to replace the bench/utils.py, bench/buffer.py? has the various test (test_intranode, test_low_latency, test_internode) worked with this ?

[CalebZ9909]

Yes, we will have a specific folder for those but they are equivalent now, those in the bench are copy of that, future modifications will base on the ones in this new folder. I am still running the inter and intra tests. Also sglang integration side saw some issues when running the test and I will talk with them then do the rest of the completed wrap up work.

[MaoZiming]

is there a way to avoid duplicating buffer.py and utils.py?

[MaoZiming]

I think the sglang integration test should largely work now. See #496

[CalebZ9909]

Yes, we can keep the original one or move to the new folder to put all the wrappers.