Ported MQSensorLib from Arduinto to ESP-IDF use. (AEGHB-1168)

[carlosdelfino]

Description

This Pull Request adds support for the ESP32-S3 microcontroller to the MQSensorsLib library. It includes updated examples, documentation, and minor code refactoring to ensure compatibility with the new hardware. The motivation is to expand the usability of the library for users adopting the latest ESP32 variants.

Related

Testing

• Tested on ESP32-S3-DevKitC-1 board with MQ-2 and MQ-135 sensors.
• All CI checks (GitHub Actions) passed.

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

	Warnings
⚠️	Some issues found for the commit messages in this PR: the commit message "Ported to ESP-IDF use.": summary should not end with a period (full stop) summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).
⚠️	The source branch "MQSensorLib" incorrect format: contains uppercase letters. This can cause troubles on case-insensitive file systems (macOS). Please rename your branch.

👋 Hello carlosdelfino, we appreciate your contribution to this project!

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