Cleanup (#197)

* Removed unused code
* Use cclog for logging
* Wrap errors so that they can be unwrapped
* Revert wrong use of slices.Delete()
* Fix derivative values should be float
* Suggestions from the gocritic linter
* Fixed: interface method AddChannel must have all named params (inamedparam)
* Enable linter: errorlint
* Replace fmt.Sprintf("%d", i)) by strconv.Itoa(i) for improved performance
* Correct misspelled words
* Break up very long lines into multiple lines
* lp.NewMessage -> lp.NewMetric
* Preallocate slices of known length

internal/metricAggregator/metricAggregatorFunctions.go

@@ -12,6 +12,7 @@ import (
 	"fmt"
 	"regexp"
 	"slices"
+	"strconv"
 	"strings"
 
 	topo "github.com/ClusterCockpit/cc-metric-collector/pkg/ccTopology"
@@ -208,7 +209,7 @@ func infunc(a any, b any) (any, error) {
 		case []int:
 			return slices.Contains(total, match), nil
 		case string:
-			smatch := fmt.Sprintf("%d", match)
+			smatch := strconv.Itoa(match)
 			return strings.Contains(total, smatch), nil
 		}