chore: set up tests

[Convly]

Description:

Set up the initial configuration to support testing in the project using Jest and ts-jest.

The following changes have been made:

1. Jest Configuration (jest.config.js):

   • Added a new configuration file to set up Jest using ts-jest for transforming TypeScript files.
   • Specifies the test environment as node and sets up the coverage report directory.

2. Package Scripts (package.json):

   • Introduced new scripts:

     • "test": Runs all the tests with verbose output.
     • "test:cov": Runs tests with coverage reporting enabled.

   • Updated dependencies to include jest, ts-jest, and @types/jest.

3. Git Ignore Updates (.gitignore):

   • Added .coverage, to the .gitignore to exclude test-related artifacts from version control.

Verification:

• Ensure that tests run successfully using the newly added test and test:cov scripts.
• Verify that new files and directories specified in the .gitignore are correctly ignored by Git.