fix: expose types for ts

[KianYang-Lee]

The types should be exported, so that typescript can resolve the types. Made it so that it's exported. nuxt package is working fine so did not PR change.

Currently when importing to a Nuxt project with default tsconfig.json setting results in this during typecheck.

Could not find a declaration file for module '@vue-dapp/modal'. '/node_modules/@vue-dapp/modal/dist/modal.mjs' implicitly has an 'any' type.
There are types at '/node_modules/@vue-dapp/modal/dist/index.d.ts', but this result could not be resolved when respecting package.json "exports".
The '@vue-dapp/modal' library may need to update its package.json or typings.

[johnson86tw]

@KianYang-Lee Hi, thanks for fixing this issue!

I published these beta versions:

• @vue-dapp/coinbase@1.5.6-beta.0
• @vue-dapp/core@1.5.6-beta.0
• @vue-dapp/modal@1.5.6-beta.0
• @vue-dapp/nuxt@1.5.6-beta.0
• @vue-dapp/walletconnect@1.5.6-beta.0

Can you try them out? If they work for you, we can merge this PR. Thanks!

[KianYang-Lee]

@johnson86tw I tested on my machine, works ! Thanks