Eager load forms code

[camertron]

What are you trying to accomplish?

This PR moves the forms framework files from lib/primer/forms to app/lib/primer/forms to take advantage of Rails eager loading capabilities in prod environments.

Integration

No changes necessary in production.

List the issues that this change affects.

Closes #3084

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

Accessibility

• No new axe scan violation - This change does not introduce any new axe scan violations.

[changeset-bot]

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Latest commit: 1958f1e

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