Use component delegation pattern for core relayer components

[soareschen]

Part of: informalsystems/hermes-sdk#9

Description

This PR introduces a component delegation pattern, and allow auto implementation of components when they implement the trait DelegateComponent<ComponentName>.

Compared to the earlier work in #3528, we only need a delegate_component! macro to implement DelegateComponent for components to delegate the implementation to another component. This eliminates the need to define multiple macros for each component trait. A plural delegate_components! macro is also introduced, to allow forwarding of multiple component implementations to the same delegated component.

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PR author checklist:

• Added changelog entry, using unclog.
• Added tests: integration (for Hermes) or unit/mock tests (for modules).
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).