Refactor MultiHeadAttention cpu op (#21055)
Refactoring of MultiHeadAttention op
- [x] Add some checking for cross attention of pass_past_in_kv to make
sure there is no kv cache and bias.
- [x] Update interface of PackVIntoRotaryQKV so that it can be used by
SparseAttention later.
- [x] Add test cases
### Motivation and Context
To prepare the pull request for SparseAttention cpu op.
