feat(core): add keys and key-sets entity

[jschmid1]

Supersedes: #9677

This is ready for a first round of reviews.

Summary

This PR adds support for managing asymmetric keys in various formats (JWK, PEM). It adds two new entities

• /keys
• /key-sets

that accept the mentioned formats.

Full changelog

• add new core entities keys and key-sets
• adds daos for keys and key-sets entities

Missing things:

• c* support or skip tests for it
• proper uniqueness of keys within a set
• docs (queued after initial review/approval)

Signed-off-by: Joshua Schmid [email protected]

[flrgh]

Looks very solid! All high level items have been well-covered by other reviewers, so for the most part my comments are all low-hanging fruit (formatting/consistency, code style, etc).

Happy to +1 this after some of @bungle and @kikito's comments are addressed.

[bungle]

Let's move on with this, thanks @jschmid1.