fix: CEPF-1168; getAppsWhichSupportAutoPayIntent enabled for Flutter Custom Checkout

[vivekshindhe]

Details

getAppsWhichSupportAutoPayIntent is a function that returns UPI Recurring enabled applications so the application list can be displayed to the user. This PR exports the native function to flutter wrapper.

Details	Description
Asana/Jira link	https://razorpay.atlassian.net/browse/CEPF-1168
Slack thread	N/A
Design source	N/A
Tech Specs	N/A
Product Specs	N/A
Related PRs	N/A
Breaking change (with back-support)	No
Impacts public apis	No
Documentation update needed	Yes
QA sign-off by	N/A
Deployment Checklist JiraId	N/A
Test Case Document URL	N/A

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

• This is to identify if BVT needs to be added for the new changes. So, one of the two labels should be added: Testing or TestingNotRequired.
• If the label Tested is added then the test cases document URL is mandatory.
• The 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 for adding a new test will pass.

Changelog

• enable function getAppsWhichSupportAutoPayIntent in flutter for android & iOS.

Checklist

• [x] **Commit message convention followed.
• [x] **Branch naming convention followed.
• [x] **Performed self review & removed the debugging code (debugger, console log etc).
• [x] **Dev Testing Done
• [x] **Sanity Testing Done
• [x] Manual testing or integration testing done.
• [ ] **QA Sign-Off given
• [ ] Updated/Added Unit Tests.
• [ ] Updated/Added Functional Tests.
• [ ] Analytics event added if new feature
• [ ] **Ensure all functions / code-blocks are wrapped in try/catch at some level (Non critical errors should not bubble up to cause payment blockers)
• [ ] **Ensure all errors are captured using error-service with severity levels
• [ ] Added explanatory comment for tricky code explaining "why".
• [x] **Tested on major devices / simulators.
• [x] Detailed description about this PR added ?