* Why?
Prior to this commit, we only supported a single multimodal input for
E/P/D disaggregated serving.
* What?
This commit does a minor refactor of the multimodal embedding handles
that cross process boundaries to enable this.
Existing unit tests are updated accordingly to test this.
The `RequestOutput` has its `mm_embedding_handle` replaced in favor of
`disaggregated_params`, addressing a previous TODO.
Signed-off-by: William Zhang <133824995+2ez4bz@users.noreply.github.com>
ca9537e17c