Generate full fqbn with options and print as one of the first lines in compile output

[ubidefeo]

Describe the request

When using boards with complex parameter sets (i.e.: ESP*), it would be nice to be able to generate the full fqbn with all the parameters.
This would allow anyone to choose the options using the IDE's GUI and reuse such output in CLI for automation.

Example:

Using board 'atxy7' from platform in folder: /Users/ubidefeo/Library/Arduino15/packages/megaTinyCore/hardware/megaavr/2.6.5
Using core 'megatinycore' from platform in folder: /Users/ubidefeo/Library/Arduino15/packages/megaTinyCore/hardware/megaavr/2.6.5

***
Board FQBN: megaTinyCore:megaavr:atxy7:chip=1607,clock=5internal,bodvoltage=1v8,bodmode=disabled,eesave=enable,millis=enabled,resetpin=UPDI,startuptime=0,uartvoltage=skip
****

Detecting libraries used...
[...]
Generating function prototypes...

Describe the current behavior

n/a

Arduino CLI version

n/a

Operating system

N/A

Operating system version

n/a

Additional context

n/a

Issue checklist

• I searched for previous requests in the issue tracker
• I verified the feature was still missing when using the nightly build
• My request contains all necessary details