Golangci lint fixes (#195)

* Add golangci-lin as make target
* Fix: could omit type ... from declaration; it will be inferred from the right-hand side (staticcheck)
* Fix func intArrayContains is unused (unused)
* Fix: could use strings.ReplaceAll instead (staticcheck)
* Fix: could expand call to math.Pow (staticcheck)
* Fix: could use tagged switch on `...` (staticcheck)
* Fix: Error return value of `...` is not checked (errcheck)
* Fix: ineffectual assignment to err (ineffassign)
* Fix: There is no need to wait for command completion
* Add cpustat, diskstat and schedstat config
* Use slices to exclude metrics
* Replaced stringArrayContains by slices.Contains
* Replace m[k]=v loop with maps.Copy
* Use module slices from the standard library. Remove use of golang.org/x/exp/slices
* Use SplitSeq and max to modernize code

collectors/collectorManager.go

@@ -9,6 +9,7 @@ package collectors
 
 import (
 	"encoding/json"
+	"fmt"
 	"sync"
 	"time"
 
@@ -104,7 +105,7 @@ func (cm *collectorManager) Init(ticker mct.MultiChanTicker, duration time.Durat
 
 		err = collector.Init(collectorCfg)
 		if err != nil {
-			cclog.ComponentError("CollectorManager", "Collector", collectorName, "initialization failed:", err.Error())
+			cclog.ComponentError("CollectorManager", fmt.Sprintf("Collector %s initialization failed: %v", collectorName, err))
 			continue
 		}
 		cclog.ComponentDebug("CollectorManager", "ADD COLLECTOR", collector.Name())