ifElseChain: rewrite if-else to switch statement (gocritic)

ifElseChain: rewrite if-else to switch statement (gocritic)

cognitive complexity 31 of func `(*KnowledgeBase).getFilters` is high (> 30) (gocognit)

cognitive complexity 32 of func `(*KnowledgeBase).filterMetadata` is high (> 30) (gocognit)

cognitive complexity 56 of func `generateReport` is high (> 30) (gocognit)

cognitive complexity 32 of func `analyzeFile` is high (> 30) (gocognit)

missing cases in switch of type reflect.Kind: reflect.Invalid, reflect.Bool, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr, reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128, reflect.Array, reflect.Chan, reflect.Func, reflect.Interface, reflect.Pointer|reflect.Ptr, reflect.Struct, reflect.UnsafePointer (exhaustive)

Error return value is not checked (errcheck)

Error return value of `hasher.Write` is not checked (errcheck)