[Master] Update compiler plugin to allow annotations

[aashikam]

Purpose

2201.7.x #770

Examples

Checklist

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

[codecov]

Codecov Report

Patch coverage: 76.19% and project coverage change: -0.08% ⚠️

Comparison is base (743ef63) 80.86% compared to head (faab7e3) 80.79%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #771      +/-   ##
============================================
- Coverage     80.86%   80.79%   -0.08%     
- Complexity        0      134     +134     
============================================
  Files            30       38       +8     
  Lines          1223     1609     +386     
  Branches        149      251     +102     
============================================
+ Hits            989     1300     +311     
- Misses          168      194      +26     
- Partials         66      115      +49     

Files Changed	Coverage Δ
...erina/stdlib/nats/plugin/NatsServiceValidator.java	88.13% <73.68%> (ø)
.../ballerina/stdlib/nats/plugin/PluginConstants.java	100.00% <100.00%> (ø)

... and 6 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.