fix(mtp): support context-parallel caller inputs (#3543)

* fix(mtp): support context-parallel inputs

Signed-off-by: SlyneD <slyned@nvidia.com>

* fix(distributed): tolerate models without capabilities

Signed-off-by: SlyneD <slyned@nvidia.com>

* fix(distributed): enforce MTP CP capability

Signed-off-by: SlyneD <slyned@nvidia.com>

* fix(mtp): reject incomplete context-parallel inputs

Signed-off-by: SlyneD <slyned@nvidia.com>

* fix(mtp): require complete context-parallel inputs

Signed-off-by: SlyneD <slyned@nvidia.com>

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Signed-off-by: SlyneD <slyned@nvidia.com>