Emit type declarations

[omkar-ethz]

Motivation

Currently, the ro-crate package as published on npm does not include type declarations. This means ts projects cannot benefit from typings for ROCrate, Entity, etc.
This PR attempts to fix project configuration to export type declarations in the npm package.

Changes

• Add declaration: true to tsconfig
• Rename types.d.ts to types.ts, as .d.ts files are not considered for compilation (stackoverflow)
• include type declarations in npm package by adding types to package.json

[omkar-ethz]

Tested with my fork that the published npm package includes type declarations: https://www.npmjs.com/package/@omkar.xyz/ro-crate

[omkar-ethz]

@alvinsw @moisbo any interest in merging this? or should we handle the absence of types by having a copy of type declarations in our project.. of course we would prefer the former:)

[alvinsw]

@omkar-ethz Sorry I just noticed your PR today. Thank you for your contribution. I am still a little bit unsure that the javascript code must be compiled using tsc, but there may not be another way. I will discuss this first with my team and do more tests.

[alvinsw]

I will merge this first and then try it, then publish it as a new version separately.

[omkar-ethz]

Thanks @alvinsw ! let me know in case of any issues

[alvinsw]

@omkar-ethz I have published v3.7.1 but I have to pin typedoc to version 0.28.13 which still uses typescript 5. If I upgrade typedoc to current version (with typescript 6), tsc will output a lot of errors. Would you be able to try and see if there is any quick workaround without having to fix all the sloppy typings (for now)?

[omkar-ethz]

@alvinsw it seems that typescript 6 made 'strict: true' as default, setting it explicitly to false in tsconfig.json got rid of most errors. I will create a PR with updated typedoc and ts versions

[omkar-ethz]

@alvinsw #32 fix for TypeScript 6