[DOC] Add core compatibility guide

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

Description of Change

Adding a new guide, to show how different ESP32 Arduino core versions can be handled within libraries or projects to keep the compatibility.

Tests scenarios

Related links

[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "Update core_compatibility.rst": summary looks empty type/action looks empty the commit message "Update core_compatibility.rst": 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).

	Messages
📖	You might consider squashing your 5 commits (simplifying branch history).

👋 Hello P-R-O-C-H-Y, we appreciate your contribution to this project!

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Generated by 🚫 dangerJS against 88e50a9

[lucasssvaz]

LGTM

[pedrominatel]

LGTM

[pedrominatel]

Remove extra chars.

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

Done, btw. @pedrominatel why this did not trigger any warning or error?