Migrate SecretsManager to new crypto interface

[Hinton]

Type of change

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

Objective

Since the Folder and Cipher refactors is stalled, I've refactored the secrets manager portion and will look into rebasing the folder work after.

Commits are structured in order and I believe the easiest way to review this is to go commit by commit.

Significant change from #3732 is that KeyRetrieval is extracted from the interfaces and only required by CryptoService.

Code changes

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

Before you submit

• Please add unit tests where it makes sense to do so (encouraged but not required)
• If this change requires a documentation update - notify the documentation team
• If this change has particular deployment requirements - notify the DevOps team

[eliykat]

Removing myself from reviewers on the understanding this will be done in the SDK instead.