Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-8544

Description

The code has been refactored to use async/await syntax, replacing the async library dependency. The async dependency has been removed.
Replace using callbacks functions with async functions for actions, import/export template functionalities.

Dependencies

https://github.com/formio/formio-server/pull/1588

Use this section to list any dependent changes/PRs in other Form.io modules

How has this PR been tested?

autotests

Checklist:

• I have completed the above PR template
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• My changes include tests that prove my fix is effective (or that my feature works as intended)
• New and existing unit/integration tests pass locally with my changes
• Any dependent changes have corresponding PRs that are listed above