Adding field logic to data package

Added a new Field struct which provides the ability to search through
unstructed data (such as the data returned from a json call), and easily
add or remove values to this data.

go.mod

@@ -11,6 +11,7 @@ require (
 	github.com/rancher/lasso v0.0.0-20230629200414-8a54b32e6792
 	github.com/sirupsen/logrus v1.9.0
 	github.com/stretchr/testify v1.8.2
+	golang.org/x/exp v0.0.0-20220722155223-a9213eeb770e
 	golang.org/x/sync v0.2.0
 	golang.org/x/text v0.11.0
 	golang.org/x/tools v0.8.0
@@ -71,7 +72,6 @@ require (
 	go.opentelemetry.io/otel/sdk v1.10.0 // indirect
 	go.opentelemetry.io/otel/trace v1.10.0 // indirect
 	go.opentelemetry.io/proto/otlp v0.19.0 // indirect
-	golang.org/x/exp v0.0.0-20220722155223-a9213eeb770e // indirect
 	golang.org/x/mod v0.10.0 // indirect
 	golang.org/x/net v0.13.0 // indirect
 	golang.org/x/oauth2 v0.8.0 // indirect

pkg/data/errors.go

@@ -0,0 +1,50 @@
+package data
+
+type errorCode int
+
+const (
+	errorInvalidData errorCode = iota + 1
+	errorInvalidField
+	errorFieldValueNotFound
+)
+
+type DataError struct {
+	message string
+	code    errorCode
+}
+
+// Error returns the underlying error message, satisfying the error interface
+func (d *DataError) Error() string {
+	return d.message
+}
+
+func newDataError(message string, code errorCode) *DataError {
+	return &DataError{
+		message: message,
+		code:    code,
+	}
+}
+
+// IsInvalidDataError checks if a given error indicates that the provided data field was invalid.
+func IsInvalidDataError(err error) bool {
+	return checkErrTypeAndCode(err, errorInvalidData)
+}
+
+// IsInvalidFieldError checks if a given error indicates that the provided field was invalid.
+func IsInvalidFieldError(err error) bool {
+	return checkErrTypeAndCode(err, errorInvalidField)
+}
+
+// IsFieldValueNotFoundError checks if a given error indicates that the provided field was not found in the provided
+// data.
+func IsFieldValueNotFoundError(err error) bool {
+	return checkErrTypeAndCode(err, errorFieldValueNotFound)
+}
+
+func checkErrTypeAndCode(err error, code errorCode) bool {
+	dataErr, ok := err.(*DataError)
+	if !ok {
+		return false
+	}
+	return dataErr.code == code
+}