Bugfix: allow paths for valueProperty

[brendanbond]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-8714

Description

Debugged an issue on a customer call where they couldn't use paths as valueProperties (e.g. pointing a Select Boxes component at a Form.io Resource URL and having a valueProperty of data.firstName). This PR works but needs to be evaluated for thoroughness and tested.

Dependencies

n/a

How has this PR been tested?

Automated tests

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