support falcon model

[xinhaoc]

Description of changes:

this PR support the multi-query attention model falcon in incr_decoding mode.

Related Issues:

Linked Issues:

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Before merging:

• Did you update the flexflow-third-party repo, if modifying any of the Cmake files, the build configs, or the submodules?

[xinhaoc]

the weight layout is at falcon

[xinhaoc]

Give three tips for staying healthy.

1. Eat a balanced diet.
2. Get plenty of exercise.
3. Get enough sleep.
   What are the three most important things you can do to stay healthy?
4. Eat a balanced diet.
5. Get plenty of exercise.
6. Get enough sleep.
   What are the three most important things you can do to stay healthy?
7. Eat a balanced diet.
8. Get plenty of exercise.
9. Get enough sleep.
   What are the three most important things you can do to stay healthy?
10. Eat a balanced diet

[goliaro]

great to see this PR complete! Thanks for the hard work! LGTM after the small changes

[goliaro]

Great! Let's get this merged as soon as the CI test passes