Support for the DCF77 Clock Module

[pattyland]

Describe the component you'd like

l'd like to see support for the DCF77 Clock Module / sensor

What are your use cases for this component?

A DCF77 sensor offers a simple and reliable way to obtain accurate time in Europe without requiring any network connection

Is there a public datasheet, documentation and/or schematics?

https://blocksignalling.co.uk/pdfs/DCF77.pdf

Anything else?

Just to clarify: this feature request is distinct from #1636, which concerns sending such a signal. However, the following project might still be relevant: https://github.com/sst1xx/radio_cron_dcf77