feat(network): Adds Network Library documentation

[SuGlider]

Description of Change

Adds documentation for Network Library (Wi-Fi, Ethernet and PPP interfaces, manager and events).

Test Scenarios

CI Only

Related links

None

[github-actions]

	Messages
📖	This PR seems to be quite large (total lines of code: 1093), you might consider splitting it into smaller PRs

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[P-R-O-C-H-Y]

You can add the new Network.isOnline() as it will be added in the PR #12000

[me-no-dev]

@P-R-O-C-H-Y done

[Copilot]

Pull Request Overview

This PR adds comprehensive API documentation for the Network library on ESP32 devices. The documentation provides a unified guide for managing multiple network interfaces including Wi-Fi (Station and Access Point), Ethernet, and PPP connections through a centralized NetworkManager.

Key Changes

• Introduces complete Network API documentation covering architecture, interfaces, events, and communication classes
• Documents the NetworkManager as central coordinator with unified interface management
• Provides extensive code examples for Wi-Fi, Ethernet, PPP, and multi-interface scenarios

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