Publish the types on JSR

[JumpLink]

We sould also publish the types on JSR, a new NPM registry build from the creators of Deno.

Reasons:

• This registry is runtime-independent and all runtimes are allowed, including GJS
• TypeScript first
• JSR handles generating API docs, would be great to get a good GJS API documentation very easily
• ESM only

[JumpLink]

This could be a problem for us: About "slow types"

[bb010g]

Do you know how to successfully import from npm:@girs/… in deno repl? I think publishing on JSR might be required for use from deno repl (i.e. from Deno without custom import maps or node_modules) due to the current use of declare module in the types on NPM.