chore: migrate repository from npm to "yarn workspaces" (aws#4588)

This brings speed and reliability improvements with respects to the
installation of dependencies.

Author: RomainMuller

.dependabot/config.yml

@@ -10,6 +10,6 @@ update_configs:
       - match:
           # Don't suggest upgrading @types/node to versions >= 9
           dependency_name: '@types/node'
-          version_requirement: '>= 9'
+          version_requirement: '>= 11'
     version_requirement_updates: increase_versions
     default_labels: []

.npmrc

@@ -0,0 +1,3 @@
+# Helps with using npm package-locally, while in a yarn workflow (avoids coupling scripts to yarn).
+# This is needed because yarn goes out of it's way to ensure it controls what `node` binary is used (for good!)
+scripts-prepend-node-path=auto