Add Retry Support

[niveathika]

Purpose

Fixes ballerina-platform/ballerina-library#8585

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

❌ Patch coverage is 87.20000% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.98%. Comparing base (2ab4ca2) to head (e49c1e1).

Files with missing lines	Patch %	Lines
...a/io/ballerina/stdlib/ftp/util/FtpRetryHelper.java	80.59%	9 Missing and 4 partials ⚠️
...a/stdlib/ftp/server/FtpContentCallbackHandler.java	81.25%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1528      +/-   ##
============================================
+ Coverage     81.70%   81.98%   +0.27%     
- Complexity      588      818     +230     
============================================
  Files            40       56      +16     
  Lines          2892     3580     +688     
  Branches        468      603     +135     
============================================
+ Hits           2363     2935     +572     
- Misses          337      391      +54     
- Partials        192      254      +62     

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[sonarqubecloud]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud