feat: DTOSS-8754 append data into mssql table

[alex-clayton-1]

Description

• Created the NbssAppointmentEvent model and accompanying migration
• Implemented the StagingPersister for mapping the data and appending it to the db table

Context

DTOSS-8754

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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Sensitive Information Declaration

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
98.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud