chore(server): cleanup all rust warnings

[fbozic]

Summary by CodeRabbit

• Refactor
  • Updated function parameters in get_context_users_handler to use placeholder variable names for improved readability.
  • Removed import of store_client_key and updated import of add_root_key in root_keys.rs.
  • Restructured routing setup in service.rs to centralize handler references within the handlers module for better organization.
  • Removed serialization of root_key to JSON using serde_json in the add_root_key function in root_key.rs.

[coderabbitai]

Walkthrough

The restructuring of the admin module in the server codebase involved organizing handlers into their respective modules, enhancing maintainability. Additionally, parameter placeholder names were introduced to improve code clarity.

Changes

File	Summary
context.rs	Updated get_context_users_handler parameters with placeholder variable names.
root_keys.rs	Removed store_client_key import, updated add_root_key import in root_keys.rs.
service.rs	Refactored routing setup, moving various handlers to their corresponding modules.
root_key.rs	Removed serde_json serialization in add_root_key function.

Poem

In code's dance, a rabbit leaps,
Restructuring paths, the server keeps,
Handlers now in cozy homes,
Serialization's burden foams,
CodeRabbit hops, in joy it beeps! 🐇🌟

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[fbozic]

No more warnings for node

❯ cargo check -p calimero-node --release
    Checking calimero-identity v0.1.0 (/Users/filipbozic/workspace/p2p/core/crates/identity)
    Checking calimero-server v0.1.0 (/Users/filipbozic/workspace/p2p/core/crates/server)
    Checking calimero-node v0.1.0 (/Users/filipbozic/workspace/p2p/core/crates/node)
    Finished release [optimized] target(s) in 3.08s