cleanup: rename unused parameters and receivers to _

[mfederowicz]

PR related with #904

all unused functions parameters and receivers have been replaced with undersorce (_) sign to supress warnings. Maybe there is more elegant way to do this, but I dont want to remove parameters declaration

test command: revive -config ~/revive.toml -formatter stylish {test,rule,revivelib}

config:

ignoreGeneratedHeader = false
severity = "warning"
confidence = 0.8
errorCode = 0
warningCode = 0

[rule.unused-parameter]
[rule.unused-receiver]

[chavacava]

Thank you @mfederowicz !