RMT save real resolution_hz in config (IDFGH-14281)

[qqqlab]

This PR save the real resolution_hz in config, so that it is accessible for the user.

Currently there is AFAIK no easy way to access the real resolution_hz, which can differ considerably from the requested resolution_hz and thus will throw off timing of the RMT pulses.

[CLAassistant]

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[github-actions]

Warnings

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

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