Feature: Enhance Observable Callback Coverage

[LK-Simon]

Summary

Extend ESPressio Event's optional observer-to-event integration so newly observable lifecycle information from ESPressio Security, Command, Sockets and ESP-Now can be bridged into EventManager consistently.

Scope

• Add Event bridges for the new observer contracts introduced by Security, Command, Sockets and ESP-Now.
• Keep upstream libraries independent of ESPressio Event wherever possible; Event integration should live in the best optional integration location.
• Provide serializable bridge variants where the underlying event payload naturally supports the established Serializable integration pattern.
• Maintain naming, ownership and lifetime semantics consistent with existing Thread and Timing Event bridges.
• Add representative tests/examples/documentation.
• Update release metadata, dependency versions, dependency documentation and changelog to consume the new upstream releases.

Compatibility

Existing Event APIs and bridges must remain supported.