feat(mdns): Make including mdns_console KConfig (IDFGH-11988)

[rretanubun]

The CLI that mdns_console offers is very useful for debugging and bootstrapping mDNS onto new projects, but some projects may not want console CLI in place to reduce binary size.

This gives a KConfig option to do so.

[CLAassistant]

All committers have signed the CLA.

[igrr]

@rretanubun do you see mdns_console contributing to binary size even when not calling mdns_console_register? (You can check with idf.py size* commands.)
I think this should normally not happen, as the linker will eliminate all the unused object files and functions from the resulting binary.

[rretanubun]

@igrr : No I do not, the linker does eliminate it. I was thinking adding an upstream supported KConfig option to allow projects to build with

#ifdef CONFIG_MDNS_ENABLE_CONSOLE_CLI
    mdns_console_register();
#endif

then each sdkconfig variant controls if the project builds gets mdns console on the CLI or not and the community going forward all just use the same KConfig name.

[david-cermak]

I agree with Ivan that this change won't affect the binary size, but may help reduce build time and since the console API is rarely used within mdns component I would tend to accept this PR, WYT @suren-gabrielyan-espressif ?

The ultimate goal should migration of the mdns_console to other console components, cc @espressif-abhikroy

[david-cermak]

@rretanubun Thanks for your contribution!
@suren-gabrielyan-espressif Thanks for the quick review!