chore: added basic jest testing support

also added an example test for the counter in the components.tsx file to demonstrate functionality of testing configuration. installed all dependencies for testing using --save-dev to make sure they are stored as dev dependencies

ref: N25B-212

jest.config.js

@@ -0,0 +1,14 @@
+export default {
+  preset: 'ts-jest/presets/default-esm',
+  testEnvironment: 'jsdom',
+  extensionsToTreatAsEsm: ['.ts', '.tsx'],
+  setupFilesAfterEnv: ['<rootDir>/test/setupTests.ts'],
+  moduleNameMapper: {
+    '^@/(.*)$': '<rootDir>/src/$1',
+    '\\.(css|scss|sass)$': 'identity-obj-proxy'
+  },
+  testMatch: ['<rootDir>/test/*.test.(ts|tsx)'],
+  transform: {
+    '^.+\\.(ts|tsx)$': ['ts-jest', { useESM: true, tsconfig: 'tsconfig.jest.json' }]
+  }
+};