Fix broken type definitions for extend-expect.d.ts

[mdgozza]

What/Why: #93 introduced a regression into the TypeScript definitions. It used invalid TypeScript syntax and re-declared properties like not which conflict with @types/jest. Errors for an empty TypeScript project:

./node_modules/jest-dom/extend-expect.d.ts:11:5 - error TS2717: Subsequent property declarations must have the same type.  Property 'not' must be of type 'InverseAsymmetricMatchers', but here has type 'InverseStringAsymmetricMatchers'.

11     not: InverseStringAsymmetricMatchers
       ~~~

./node_modules/jest-dom/extend-expect.d.ts:16:7 - error TS2713: Cannot access 'Expect.stringContaining' because 'Expect' is a type, but not a namespace. Did you mean to retrieve the type of the property 'stringContaining' in 'Expect' with 'Expect["stringContaining"]'?

16     | Expect.stringContaining
         ~~~~~~~~~~~~~~~~~~~~~~~

./node_modules/jest-dom/extend-expect.d.ts:17:7 - error TS2713: Cannot access 'Expect.stringMatching' because 'Expect' is a type, but not a namespace. Did you mean to retrieve the type of the property 'stringMatching' in 'Expect' with 'Expect["stringMatching"]'?

17     | Expect.stringMatching
         ~~~~~~~~~~~~~~~~~~~~~

./node_modules/jest-dom/extend-expect.d.ts:18:7 - error TS2713: Cannot access 'Expect.any' because 'Expect' is a type, but not a namespace. Did you mean to retrieve the type of the property 'any' in 'Expect' with 'Expect["any"]'?

18     | Expect.any
         ~~~~~~~~~~

./node_modules/jest-dom/extend-expect.d.ts:19:7 - error TS2713: Cannot access 'Expect.anything' because 'Expect' is a type, but not a namespace. Did you mean to retrieve the type of the property 'anything' in 'Expect' with 'Expect["anything"]'?

19     | Expect.anything
         ~~~~~~~~~~~~~~~

./node_modules/jest-dom/extend-expect.d.ts:20:7 - error TS2713: Cannot access 'Expect.not' because 'Expect' is a type, but not a namespace. Did you mean to retrieve the type of the property 'not' in 'Expect' with 'Expect["not"]'?

20     | Expect.not
         ~~~~~~~~~~

How: This PR fixes the types based on the intentions of the author of #93 and the types in @types/jest. Unfortunately, Jest does not provide better typings for matchers like expect.stringContaining('foo') than any.

https://github.com/DefinitelyTyped/DefinitelyTyped/blob/d17c14a550e68b0a1811afabd40677c7580f3579/types/jest/index.d.ts#L482

Checklist:

• Documentation (n/a)
• Tests (n/a)
• Updated Type Definitions
• Ready to be merged
• Added myself to contributors table

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🎉 This PR is included in version 3.2.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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