Check unused configurations

[a-malyshev]

It would be useful to conduct the experiment to check unused configs using kanalysis.

for example, if .config file of Kbuild project contains set CONFIG_A and CONFIG_B configurations and only CONFIG_A is used in the build then kanalysis might show that 50% of configs are not used and show which ones.

Eventually, this will help developers accurately identify redundant configurations and achieve clarity in the code.