Refactor tsconfig for Stricter Type-Safe Settings

[y-hsgw]

I have made the following changes:

• Fixed type errors in the test files.
• Updated plugin.config. Reference: eslint-plugin-jest.

There may be some misunderstandings on my part, but I would appreciate your review.

[veritem]

I don't think we want to change anything in index.ts. there are a lot of differences in how types are handled in this package and in jest's

[veritem]

let's keep changes under test/ and revert everything else. also keep include test direction in tsconfig.json, I forgot to add it

[y-hsgw]

I have reverted most of the changes in index.ts.
I decided to remove ESLint.Plugin as it caused type errors in rules and seemed inappropriate.

[veritem]

will investiage why types are mistmatching, it used to work!