Store notification content as binary to support unicode

[darshanasbg]

Proposed changes in this pull request

$subject. Related to,

• Have the ability to support non-latin unicode characters for email templates wso2/product-is#21235

When should this PR be merged

After merging,

• Store notification content as binary to support unicode wso2/carbon-identity-framework#6120

Follow up actions

When updating product-is versions, both the framework change and this should be update together.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 44 lines in your changes missing coverage. Please review.

Project coverage is 17.00%. Comparing base (5cba885) to head (4298c19).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
.../org/wso2/carbon/email/mgt/util/I18nEmailUtil.java	0.00%	16 Missing ⚠️
...mail/mgt/store/dao/AppNotificationTemplateDAO.java	0.00%	14 Missing ⚠️
...mail/mgt/store/dao/OrgNotificationTemplateDAO.java	0.00%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #280      +/-   ##
============================================
- Coverage     17.11%   17.00%   -0.12%     
  Complexity      180      180              
============================================
  Files            53       53              
  Lines          3027     3047      +20     
  Branches        332      333       +1     
============================================
  Hits            518      518              
- Misses         2467     2487      +20     
  Partials         42       42              

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[Copilot]

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 suggestions.

Files not reviewed (1)

• pom.xml: Language not supported