[DSDK 146] Setup bundler - build system for monorepo

[jdabbech-ledger]

📝 Description

Make it build

❓ Context

• JIRA or GitHub link: DSDK-146 DSDK-59

✅ Checklist

Pull Requests must pass the CI and be code reviewed. Set as Draft if the PR is not ready.

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • setup eslint with custom config
  • eject sample app
  • build & dev ok
  • lint ok

🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)