Allow using types without initializing entire package

[ConcernedHobbit]

As a developer, I want to use github-script in my CI workflow. With large scripts, it becomes necessary to move from inline usage to importing from a separate file (i.e. script.ts). When developing, I want to make sure type safety is followed, so I want to import the typing provided by github-script.

github-script has multiple issues that make this nearly impossible in my dev environment:

• I don't allow install scripts, but @actions/github-script@7.0.1 has them;

The git-hosted package "@actions/github-script@7.0.1" needs to execute build scripts but is not in the "onlyBuiltDependencies" allowlist.

• github-script wants node>=24. I'm in the process of upgrading the environment, but there are some blockers. If I only want types, I shouldn't need node>=24.

Could the types be released as a separate package, making it easier to develop github-script CI flows without having to trust a blackbox install scripts or having the latest node.