wip: start balancer exit pool hook dapp poc#1

Draft

yvesfracari wants to merge 4 commits intodevelopfrom pedro/cow-333-create-a-balancer-join-and-exit-pool-hook-on-hook-store

+935-16

Commits on Aug 7, 2024

wip: start balancer exit pool hook dapp poc
$yvesfracari$ yvesfracari
committed

Commits on Aug 8, 2024

wip: add exit pool calldata encoding
$yvesfracari$ yvesfracari
committed

Commits on Aug 10, 2024