FIO-7733: update webform types; export webform;

[brendanbond]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-7733

Description

Exports Webform for type completion along with type annotations for form options.

Dependencies

• core#34

How has this PR been tested?

n/a, tests pass locally but will not pass until the above dependency is merged

Checklist:

• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation (if applicable)
• [x] My changes generate no new warnings
• [x] 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
• [x] Any dependent changes have corresponding PRs that are listed above