New feature to add chat link to user

[KizerovDmitriy]

GreenCityUBS PR (dev)

Summary Of Changes 🔥

• added new fields to User entity and UserWithSomeOrderDetailDto.
• added new endpoint.
• added new ChatLinkDto.
• added tests.

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• Code is up-to-date with the dev branch.
• You've successfully built and run the tests locally.
• There are new or updated unit tests validating the change.
• JIRA/ Github Issue number & title in PR title (ISSUE-XXXX: Ticket title)
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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
81.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud