feat: remove production dependency on "jest" and "@jest/globals", only depend on "jest-mock"

[thecopy]

Hello!

Thanks for this very useful library.

This PR removes dependencies on jest and @jest/globals.

Reasoning:

• Reduces dependencies/footprint
• Comaptible with native Node test runner.

I suspect supporting non-Jest test runners are probably not within scope of this libary, however, jest-mock is an official jest package exposing the functionality this library need.

 PASS  src/Matchers.spec.ts
 PASS  src/Mock.spec.ts

Test Suites: 2 passed, 2 total
Tests:       161 passed, 161 total
Snapshots:   0 total
Time:        1.112 s, estimated 2 s