feat(codegen): commit generated client types to codebase (#3492)

## What

Commit generated client types to codebase.

## Why

As a developer, we will provides better visibility on the impact of OAS changes to the generated type. Also allow for browser the types on GitHub.

## How

* Remove `/lib` from .gitignore
* Add a non-blocking github action check validating if the latest generated build has been committed.
  * Runs `yarn build --force --no-cache` on GitHub. Caching was creating false positives.
  * Use `git status` and filter the output to target only `packages/generated` directory. 

## Test

Proof of a failing check:
https://github.com/medusajs/medusa/actions/runs/4432323763/jobs/7776235128

UPDATE: Failing check after updating branch with latest develop
https://github.com/medusajs/medusa/actions/runs/4436707954/jobs/7785472045

scripts/assert-codegen-build-committed-actions.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# Stackoverflow: How do I programmatically determine if there are uncommitted changes?
+# https://stackoverflow.com/questions/3878624/how-do-i-programmatically-determine-if-there-are-uncommitted-changes
+
+IS_CI="${CI:-false}"
+
+if [ "$IS_CI" = true ]; then
+  git config --local url."https://github.com/".insteadOf git@github.com:
+  git config --local user.name "Medusajs Bot"
+  git config --local user.email "core@medusa-commerce.com"
+fi
+
+FILE_CHANGES=$(git status --porcelain=v1 | grep 'packages/generated')
+FILE_CHANGES_COUNT=$(git status --porcelain=v1 | grep 'packages/generated' | wc -l)
+
+if [ "$IS_CI" = true ]; then
+  git config --local --unset user.name
+  git config --local --unset user.email
+  git config --local --unset url."https://github.com/".insteadOf
+fi
+
+if [ "$FILE_CHANGES_COUNT" -ne 0 ]; then
+  echo "$FILE_CHANGES"
+  echo "Latest codegen build was not committed. Run 'yarn build' and commit generated files."
+  exit 1
+else
+  echo "All has been committed."
+  exit 0
+fi