Remove config dep in updateContentBlacklist by extracting api signing

[vicky-g]

Trello Card Link

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Description

Running updateContentBlacklist.js logs an error about a dep on config. This PR remove the config dep by extracting the api signing logic to another file.

Services

• Discovery Provider
• Creator Node
• Identity Service
• Libs
• Contracts
• Service Commands
• Mad Dog

Does it touch a critical flow like Discovery indexing, Creator Node track upload, Creator Node gateway, or Creator Node file system?

• 🚨 Yes, this touches ••Content Blacklist••

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide repro instructions & any configuration.
Include log analysis if applicable.

1. Run the script for a track in staging
2. Check the associated creator nodes on staging that when hitting the route ipfs/<CID> an error like this appears:

{
  "error": "CID QmPLrsrZ8mGcAcabBWg8vBwCwLSzGGsbgvmk9u8yxKNk81 has been blacklisted by this node."
}

Please list the unit test(s) you added to verify your changes.

[dmanjunath]

Nice work!