chore: centralize shared dependencies

[picard8472]

This pull request refactors dependency management across the workspace by centralizing shared dependencies in the root Cargo.toml under [workspace.dependencies]. Individual crates now reference these shared dependencies using the .workspace = true syntax, reducing duplication and making version management easier.

Workspace dependency management improvements:

• Added a [workspace.dependencies] section to the root Cargo.toml to centralize versions for shared dependencies like anyhow, axum, clap, object_store, prometheus-client, serde, tokio, tracing, and others.
• Updated crates/superbank/Cargo.toml to use .workspace = true for dependencies now managed in the workspace, including anyhow, axum, clap, object_store, prometheus-client, serde, serde_json, superbank-solparq, tokio, tokio-util, tracing, and tracing-subscriber. [1] [2]
• Updated crates/superbank-solparq/Cargo.toml to use .workspace = true for the same set of shared dependencies.

These changes make dependency updates and version consistency much easier to manage across the whole workspace.