feat : added help to cibuildwheel script

.gitlab/ci/cibuildwheel_build_deps_before_build_wheel.sh

 #!/bin/bash
 set -x
 set -e
+if [[ "$1" == "" ]]; then 
+  echo "build aidge deps in cibuildwheel container before building wheel."
+  echo "search path defines where the dependencies will be searched."
+  echo "Hint : In wheel containers, files are mounted on /host by default."
+  echo "\nusage : ./cibuildwheel_build_deps_before_build_wheel.sh $search_path"
+fi
 if [[ $AIDGE_DEPENDENCIES ==  "" ]]; then # case for aidge_ core
   mkdir -p build # creating build if its not already there to hold the build of cpp files
   rm -rf build/* # build from scratch