Add Halmos support for formal verification (#5034)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

.github/actions/gas-compare/action.yml

@@ -1,4 +1,5 @@
 name: Compare gas costs
+description: Compare gas costs between branches
 inputs:
   token:
     description: github token

.github/actions/setup/action.yml

@@ -1,4 +1,5 @@
 name: Setup
+description: Common environment setup
 
 runs:
   using: composite

.github/actions/storage-layout/action.yml

@@ -1,4 +1,5 @@
 name: Compare storage layouts
+description: Compare storage layouts between branches
 inputs:
   token:
     description: github token