FIO-3820: File synchronization feature

[roma-formio]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-3820

Description

Reimplemented file component. Added file synchronization feature.

Dependencies

This PR depends on the following PRs from other Form.io modules:
formio/bootstrap#79
https://github.com/formio/formio-server/pull/1367

Checklist:

• 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

[roma-formio]

Need additional sync with this PR #5356. Will do it when this PR is merged into the master branch.

[brendanbond]

This looks pretty good, but tests are failing - can we get to the bottom of that?

[roma-formio]

This looks pretty good, but tests are failing - can we get to the bottom of that?

Some tests depend on @formio/bootstrap changes for the file component. Tests should pass after pulling the newest version of @formio/bootstrap. Verified locally, updated @formio/bootstrap, ran updateRenders, and all tests passed.