fix: set default field to any and fix validator function return type

[btw17]

The basics

• I branched from develop
• My pull request is against develop
• My code follows the style guide
• I ran npm run format and npm run lint

The details

Resolves

Although the default Field type T should eventually be unknown, set it to any so it does not break users with subclasses extending from Field in the meantime.

Proposed Changes

• Update core/field.ts - FieldValidator to provide the correct return type.
• Update core/field.ts - T = unknown to T = any

Behavior Before Change

TypeScript users with classes extending from Field would have to fill in a type for Field or their code will break.

Behavior After Change

TypeScript users can now extend from Field without providing the value type.

Reason for Changes

This is for introducing the Field type information in multiple stages.

Test Coverage

N/A

Documentation

N/A

Additional Information

Nope!

[maribethb]

LGTM, but can you call this a fix instead of a chore? Chores will now be excluded from the release notes and should only be for internal-facing things developers have no reason to care about.

Thanks!