Fix bug with ALiBi in Bloom Architecture Adapter

[jlarson4]

Description

The Bloom Architecture Adapter did not properly split joint QKV, and did not properly handle Bloom's ALiBi attention. This resolves those issues.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have not rewritten tests relating to key interfaces which would affect backward compatibility