test: migrate config file to TypeScript

[nogic1008]

Jest supports jest.config.ts configuration file since v26.6.0.
This PR migrates jest.config.js file to TypeScript, and make this repository all pure TypeScript!

Ref

• https://jestjs.io/docs/configuration

[commit-lint]

Tests

• migrate config file to TypeScript (aa3a48f)

Chore

• recreate lock file (4991c0a)

Build System

• exclude jest.config.ts file from build (45e0e95)

Contributors

@nogic1008

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[codecov]

Codecov Report

Merging #248 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #248   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           43        43           
  Branches         6         6           
=========================================
  Hits            43        43           

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