refactor: Switching to TypeScript

[IAreKyleW00t]

Why?

TypeScript gives us more control over the logic of setting up regctl, such as better validation and error handling. The biggest reason is to properly utilize a Runners built-in hostedtoolcache, which will automatically cache the regctl binary across runs without the need for additional upload/downloads like the normal actions/cache Action does. In addition to this, a much more thorough test suite is written for both the code and Action itself.

While these changes don't make the biggest difference for a tool as small as regctl, but we should still align to best practices when it comes to setting up runner tooling.

v1 and v2 will be maintained for critical issues.

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