feat: recursive config search (#2166)

* refactor: experiments flags

* refactor: args.Parse

* feat: recursive search for taskrc files

* feat: consolidate some code into new fsext package

* feat: add tests for search and default dir

* fix: linting issues

errors/errors.go

@@ -8,6 +8,11 @@ const (
 	CodeUnknown            // Used when no other exit code is appropriate
 )
 
+// TaskRC related exit codes
+const (
+	CodeTaskRCNotFoundError int = iota + 50
+)
+
 // Taskfile related exit codes
 const (
 	CodeTaskfileNotFound int = iota + 100

errors/errors_taskrc.go

@@ -0,0 +1,20 @@
+package errors
+
+import "fmt"
+
+type TaskRCNotFoundError struct {
+	URI  string
+	Walk bool
+}
+
+func (err TaskRCNotFoundError) Error() string {
+	var walkText string
+	if err.Walk {
+		walkText = " (or any of the parent directories)"
+	}
+	return fmt.Sprintf(`task: No Task config file found at %q%s`, err.URI, walkText)
+}
+
+func (err TaskRCNotFoundError) Code() int {
+	return CodeTaskRCNotFoundError
+}