Box variant for pallet calls

[gui1117]

This way the size of the pallet calls are not "shared", some pallet can have very big calls while some other keep small ones, they don't all inherit the size of the biggest pallet call.

[gui1117]

the consequence are a slightly more expensive batch and batch_all similar to #9339
Needs #9343 to benchmark properly

[gui1117]

Damn but that requires lot of change every time we match on the pallet call variant :-/

[gui1117]

for me best solution was still #9339