[WIP] feat: variable length data output from Wasm runtime#3

Draft

jdvlio wants to merge 4 commits intoimport-datafrom varlen-data-out

+58-8

Commits on Jan 27, 2022

chore: calculate input data size and allocate pages accordingly
jdvlio
committed

Commits on Jan 31, 2022

chore: calculate pages needed for the input/output buffer in memory
jdvlio
committed
fix(wasmi-impl): fix compilation, vec import & variable mutability
jdvlio
committed

Commits on Feb 2, 2022

fix(wasmi-impl): memory calculation is now simpler and more robust
jdvlio
committed