[SM-60] Secrets

[Hinton]

Objective The purpose of this PR is to create a database table, entity, and repository for the new Secret database table.

The new Secret table will use entity framework for all database providers.

Type of change

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

Objective

Code changes

• file.ext: Description of what was changed and why

Before you submit

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

[bw-ephemeral-env-bot[bot]]

Ephemeral Environment

Server Branch/Tag	Web Branch/Tag	Status
sm-secrets-feature	sm-secrets-feature	Error updating environment with commit: fba142d.
-	-	-

Instructions

Details

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Additional information can be found here.

[Hinton]

All the endpoints should be behind the [SecretsManager] attribute which for this use case is our feature flag. We'll do the final testing once it's merged to master.