feat: Add type annotations to PiniaService

[Granipouss]

Hi,

Following issues I had with types (see https://github.com/marshallswain/feathers-pinia/issues/143 & https://github.com/marshallswain/feathers-pinia/issues/144), here is a proposal to improve the situation a bit.

There remains type errors is the tests, mostly because the contact model is extended (with birthdate and description)

• tests/instance-api/instance-patch-diffing.test.ts
• tests/instance-api/instance-temps.test.ts
• tests/stores/use-data-store-storage.test.ts
• tests/use-find-get/use-find-hybrid.test.ts

Solved

This is mostly a quick fix, I found the typing is still a bit lacking, if you want I can look deeper into it and try to annotate the stores and composables.

Cheers,

[marshallswain]

Thank you for this. I'll release it today.