feat: integrate @storybook/addon-a11y for accessibility testing

[praveenreddy1798]

Changes in the PR

1. Added @storybook/addon-a11y ^6.5.15 version for Accessibillity testing
2. Upgraded @storybook/addon-actions, @storybook/addon-essentials, @storybook/addon-links, @storybook/node-logger and @storybook/react to ^6.5.15 . This is to make sure that they are compatible with each other

Screenshots

Why Storybook's a11y addon for accessibility testing ?

1. Component-level violations - Unlike tools like Lighthouse that provide page-level violations, It helps pinpoint violations on a component-level. This helps you get feedback as you write your components.

2. Great feedback - It no only pinpoint violations on a component-level, but also provides resources and links to educate about the violations and how to go about fixing them.

3. Automation - It helps you integrate these accessibility tests into your test automation pipeline with Storybook test runner and axe-playwright with ease.

4. Flexibility to choose your rules - Storybook allows users to choose your own rules and features from the Axe API in their Storybook configuration. There are options to include or exclude rules based on the accessibility standards that you are looking to follow.

5. Color blindness emulator - A11y provides a color blindness emulator for visual testing.
   This helps you relate to users with disabilities in ways that wouldn’t have been possible before

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