[parachain-template] refactor pallet configurations for enhanced modularity

[asiniscalchi]

This series of patches refactors the configuration of various pallets into their own separate modules. The primary goal of this refactor is to improve the modularity and readability of the runtime configuration.

• Moves the configuration for each pallet into its own module under runtime/src/configs. This includes configurations for aura, authorship, balances, and several others.
• Each module contains the configuration parameter

[bkchr]

I'm not convinced that this improves the readability. You split up 250 lines across multiple files. IMO this makes it much harder to find all the configs. For bigger runtimes this probably makes sense, but not for such small runtimes.

[asiniscalchi]

An 800-line lib.rs could suggest a refactor is due for clarity and maintainability, might aligning with the parachain-template-runtime module's goal to exemplify best practices.

This proposal for refactoring is merely an initial step towards this objective.

[bkchr]

Then maybe add all of them to the same config.rs. I honestly see no justification for splitting it up into that many files.

[asiniscalchi]

Placing all configurations in a single config.rs file is a more cautious approach.

It's a good middle ground: #3809