[PS-1185] Add CreationDate to CipherResponse

[frankeld]

Type of change

- [ ] Bug fix
- [x] New feature development
- [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [ ] Other

Objective

Includes CreationDate in CipherResponse so the data is included in API responses.

Screenshot: Network response from GET | https://localhost:8080/api/sync?excludeDomains=true now returns creationDate.

Code changes

• src/Api/Models/Response/CipherResponseModel.cs: Added cipher.CreationDate

Before you submit

- [x] I have checked for formatting errors (`dotnet format --verify-no-changes`) (required)
- [NA] If making database changes - I have also updated Entity Framework queries and/or migrations
- [NA] I have added **unit tests** where it makes sense to do so (encouraged but not required)
- [NA] This change requires a **documentation update** (notify the documentation team)
- [NA] This change has particular **deployment requirements** (notify the DevOps team)

[bitwarden-bot]

Thank you for your contribution! We've added this to our internal Community PR board for review. ID: PS-1185

[MGibson1]

Actually, @frankeld would you mind merging in master branch changes? I got too excited...

Once done we can get this moved forward along with https://github.com/bitwarden/clients/pull/3181

[MGibson1]

Awesome, Thanks for this! I think this is a totally natural addition 😄