Add unicode data type support for notification templates

[darshanasbg]

Proposed changes in this pull request

$subject.

Related with

• Use native unicode data types for notification templates wso2/carbon-identity-framework#6078

[codecov]

Codecov Report

Attention: Patch coverage is 2.10526% with 93 lines in your changes missing coverage. Please review.

Project coverage is 16.80%. Comparing base (8826274) to head (ded1925).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...mail/mgt/store/dao/AppNotificationTemplateDAO.java	2.08%	47 Missing ⚠️
...mail/mgt/store/dao/OrgNotificationTemplateDAO.java	2.12%	46 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #274      +/-   ##
============================================
- Coverage     17.00%   16.80%   -0.20%     
  Complexity      179      179              
============================================
  Files            53       53              
  Lines          3046     3094      +48     
  Branches        335      349      +14     
============================================
+ Hits            518      520       +2     
- Misses         2487     2533      +46     
  Partials         41       41              

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