[Notification Template API] Add Notification Template API Resource

[RushanNanayakkara]

Purpose

Adds Notification Template API as an API resource which supports template operations for all available notification channels. (Email, SMS)

Related Issues

• https://github.com/wso2-enterprise/asgardeo-product/issues/25122

Related PRs

• [Notification Template API] API Implementation identity-api-server#629
• [Notification Template API] Event Handler Implementation wso2-extensions/identity-event-handler-notification#250
• [Notification Template API] Add notification template management functions wso2-extensions/identity-governance#832

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.38%. Comparing base (ccc2502) to head (bfcda1b).
Report is 14 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5784      +/-   ##
============================================
+ Coverage     23.31%   23.38%   +0.06%     
- Complexity     6255     6266      +11     
============================================
  Files          1561     1561              
  Lines         99253    99251       -2     
  Branches      15190    15190              
============================================
+ Hits          23145    23211      +66     
+ Misses        72835    72770      -65     
+ Partials       3273     3270       -3     

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