feat: implement certification endpoints

[GuiBibeau]

Description of the pull request

The subnet's focus is on edge delivery of AI at scale. We are implementing a certification mechanisms for the miners to ensure they are running approved images in the subnet. This will ensure nobody is trying to game the system. This security will have multiple facets. Rotating certification keys is one of them. The scenario goes like this:

1. A miner downloads a signed certified docker image and runs it
2. The docker image will show a checksum hash of itself proving it's identity.
3. The certification api will return a private value associated with this image to be included in API responses from miners
4. this certification will change at a random moment forcing miners to re authenticate

This PR includes is the API side of this flow.

Changes made

1. move redis client into a common file to avoid code duplication
2. create a put and get endpoint for the certicicates. The put endpoint is bearer protected since only admins can update the certificate
3. create a get endpoint checking the validity of hash and image signature, returns the current rotating certificate

Related issues

Testings done

Screenshots (if any)

Checklist

• I have written tests
• My code does not produce new errors
• I gave myself a code review before asking others.

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Name	Status	Preview	Comments	Updated (UTC)
akeru-akeru-frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 8, 2024 0:25am

[TommieNg]

LGTM. 👍🏻

[tobySolutions]

LGTM! Great work Gui!!!