feat(template): use moduleResolution: bundler

[erickzhao]

Description

ref #4082 (comment)

In our TypeScript templates, applies module: preserve and moduleResolution: bundler.

Vite-specific changes

• This PR required a change in the Vite plugin to properly export forge-vite-env.d.ts so that it could be consumed by the types field in tsconfig.json.
• The above change means that we no longer need to create a separate forge.env.d.ts in the template.

BaseTemplate initialization changes

• This is not strictly necessary for this PR. Feel free to force me to split it off.
• BaseTemplate now merges all package.json fields from the tmpl folder. Effectively, this makes it more intuitive to pass template-specific configuration (instead of writing static strings into the package.json via JavaScript).

Typechecker tests

I added a new tsc --noEmit script into each TypeScript template. This is used in a new test that validates that all the types are happy. :)

Testing

• Added the aforementioned typechecker tests
• I iterated on this solution by testing with yarn patch in a sample Vite app: tinyspeck/sleuth@fd24c7b

[BlackHole1]

LGTM