chore: change flags name to lowercase in flags api

[RgnDunes]

Description

This PR changes the country codes to lower case in flags api.

Changes Made

List the main changes made in this pull request.

Title	---
JIRA link	NA
Slack thread (if any)	NA
Product spec	NA
Tech spec/One-pager	NA
Bundle Size Difference	NA
Fixes Issue	NA

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update
• [x] This change is a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [ ] Is your change backward compatible ?
• [ ] Tested on major browsers (Chrome, Firefox, Safari, IE) ?
• [ ] Tested in a consumer application(s) ?

Additional Notes

Any additional information that would be helpful for the reviewer.

Checklist:

• [ ] Add Jira ID(s) in PR title and in the description?
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My code is written in TypeScript and follows the coding standards of the project.
• [x] I have added relevant documentation and updated the README if necessary.
• [x] My commit messages are clear and follow the project's commit message conventions.
• [ ] Is any external library added?
• [x] My changes do not introduce any new runtime errors or warnings.
• [x] All relevant unit tests have been added/updated in my PR for the change.
• [ ] Any Screenshots (mobile & desktop) required for PR? If yes, have you added the respective screenshots ?
• [x] Any manual dev testing done by you on beta/func environment?
• [x] Reviewer added (SLA 2 days)

Reviewer Checklist

• [ ] Sufficient QA/Dev-Testing is done with proof (test cases list)
• [ ] Ensure that the change in bundle size falls within the acceptable range.

---

PR Title Format

Format: <type>: <subject>

Types can be as follows:

• feat: (new feature for the user, not a new feature for build script)
• fix: (bug fix for the user, not a fix to a build script)
• docs: (changes to the documentation)
• style: (formatting, missing semi colons, etc; no production code change)
• refactor: (refactoring production code, eg. renaming a variable)
• test: (adding missing tests, refactoring tests; no production code change)
• chore: (updating grunt tasks etc; no production code change)

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 5a821e86d1350257fbcceac068da0732a16f4209

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | -------------------- | ----- | | @razorpay/i18nify-js | Patch |

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Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions[bot]]

Unit Test Results

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Results for commit 9d16b633.

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Unit Test Results

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Results for commit 8369ae58.

[rzpcibot]

	Warnings
:warning:	Your PR has over 600 lines of code additions :scream: . Try to breakup into separate PRs :+1:

Bundle Size Report

Files

click to expand/collapse

| 🟢 No Change | 🗑 File Deleted | 🆕 New File | 📈 Size Increased | 👍 Size Reduced | | --- | --- | --- | --- | --- |

		Parsed (kb)
🚦	File Name	Base	PR	Diff	%
📈	cjs/index.js	146.22	147.04	$\textcolor{red}{0.82}$	0.56
📈	esm/index.min.js	52.8	53.32	$\textcolor{red}{0.52}$	0.98
📈	umd/index.js	166.76	167.81	$\textcolor{red}{1.05}$	0.63

Generated by :no_entry_sign: dangerJS against 5a821e86d1350257fbcceac068da0732a16f4209

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.53%. Comparing base (4d52f92) to head (5a821e8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #149 +/- ## ======================================= Coverage 96.52% 96.53% ======================================= Files 48 48 Lines 662 663 +1 Branches 162 162 ======================================= + Hits 639 640 +1 Misses 23 23 ```

:umbrella: View full report in Codecov by Sentry.
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