Wrapper for OAuth URLs

[shwatang]

Note :- Please follow the below points while attaching test cases document link below:

- If label Tested is added then test cases document URL is mandatory.

- Link added should be a valid URL and accessible throughout the org.

- If the branch name contains hotfix / revert by default the BVT workflow check will pass.

Test Case Document URL
https://docs.google.com/spreadsheets/d/1Zg9jLtF5elZHVyECO8jERagpO2yINxKyfnYj5Ke6S2M/edit#gid=0

[codecov-commenter]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (69779b2) 73.67% compared to head (9b629da) 83.77%.

Files	Patch %	Lines
src/main/java/com/razorpay/PayloadValidator.java	91.22%	2 Missing and 3 partials :warning:
src/main/java/com/razorpay/ApiUtils.java	82.60%	3 Missing and 1 partial :warning:
src/main/java/com/razorpay/OAuthTokenClient.java	96.72%	1 Missing and 1 partial :warning:
src/main/java/com/razorpay/Utils.java	90.47%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #302 +/- ## ============================================= + Coverage 73.67% 83.77% +10.10% - Complexity 240 306 +66 ============================================= Files 53 58 +5 Lines 528 709 +181 Branches 20 31 +11 ============================================= + Hits 389 594 +205 + Misses 120 91 -29 - Partials 19 24 +5 ``` | [Flag](https://app.codecov.io/gh/razorpay/razorpay-java/pull/302/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=razorpay) | Coverage Δ | | |---|---|---| | [tests](https://app.codecov.io/gh/razorpay/razorpay-java/pull/302/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=razorpay) | `83.77% <93.26%> (+10.10%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=razorpay#carryforward-flags-in-the-pull-request-comment) to find out more.

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