refactor: Merge Identity and Friend modules, misc

[dariusc93]

What this PR does 📖

• Merges identity and friends module together
• Simplify logic when receiving identity request
• Reduce spawned task when receiving events or requests or making specific calls
• Perform check on identity document prior to signature validation
• Refactor Config
• Move identity cache into its own task
• Move root document into its own module and task

Which issue(s) this PR fixes 🔨

N/A

Special notes for reviewers 🗒️

Additional comments 🎤

• This simplifies the logic and prep for when a remote implementation is implemented to be used as a option for a registry and offline routing.