feat: migrate to typescript

[abramenal]

Checklist:

• [ ] No linting issues
• [ ] Commits are compliant with commitizen
• [ ] CI tests have passed
• [ ] Documentation updated

Summary of changes

Please provide here description of how this PR changes the codebase and the application and/or what bugs it fixes.

Linked issues

Closes #263

[cypress[bot]]

---

Test summary

39 • 0 • 0 • 0

---

Run details

Project	cypress-file-upload
Status	Passed
Commit	c53c91bc16 ℹ️
Started	Oct 24, 2021 7:16 PM
Ended	Oct 24, 2021 7:17 PM
Duration	01:46 💡
OS	Linux Debian - 10.8
Browser	Firefox 86

View run in Cypress Dashboard ➡️

---

This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard