Adds Typescript Types Compilation

[AdelinoGP]

Thanks for your work on this librar, it's been really useful.

I noticed there was a previous attempt to convert the project to TypeScript. Instead of changing the existing codebase, this pull request adds a TypeScript declaration generation step (.d.ts) using the current JSDoc annotations as the source of truth. This provides TypeScript support for consumers while keeping the implementation in JavaScript.

[chrismayer]

Hi @AdelinoGP, thank you very much for this. Since I am not a TypeScript guy I cannot fully check/review your code. But I really like the general idea deriving the types from the current code. Two little questions:

1. When I got it right, there should be no impact in the "normal" vanilla JS version of the software, right?

2. Would you be availbale for possible upcoming questions popping up here once the TypeScript support is merged in the geoserver-node-client?

Thanks in advance.

[chrismayer]

Hi @AdelinoGP , are there any news on this? Thanks in advance...