[#74] apemanager: Generate protobufs for apemanager service

* Generate protobufs.
* Make marshallers, unmarshallers, json-encoders etc.
* Create message encoding/decoding unit-tests.

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

apemanager/status.go

@@ -0,0 +1,76 @@
+package apemanager
+
+import (
+	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/status"
+	statusgrpc "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/status/grpc"
+)
+
+// LocalizeFailStatus checks if passed global status.Code is related to ape manager failure and:
+//
+//	then localizes the code and returns true,
+//	else leaves the code unchanged and returns false.
+//
+// Arg must be non-nil.
+func LocalizeFailStatus(c *status.Code) bool {
+	return status.LocalizeIfInSection(c, uint32(statusgrpc.Section_SECTION_APE_MANAGER))
+}
+
+// GlobalizeFail globalizes local code of ape manager failure.
+//
+// Arg must be non-nil.
+func GlobalizeFail(c *status.Code) {
+	c.GlobalizeSection(uint32(statusgrpc.Section_SECTION_APE_MANAGER))
+}
+
+const (
+	// StatusAPEManagerAccessDenied is a local status.Code value for
+	// ACCESS_DENIED ape manager failure.
+	StatusAPEManagerAccessDenied status.Code = iota
+)
+
+const (
+	// detailAccessDeniedDesc is a StatusAccessDenied detail ID for
+	// human-readable description.
+	detailAccessDeniedDesc = iota
+)
+
+// WriteAccessDeniedDesc writes human-readable description of StatusAccessDenied
+// into status.Status as a detail. The status must not be nil.
+//
+// Existing details are expected to be ID-unique, otherwise undefined behavior.
+func WriteAccessDeniedDesc(st *status.Status, desc string) {
+	var found bool
+
+	st.IterateDetails(func(d *status.Detail) bool {
+		if d.ID() == detailAccessDeniedDesc {
+			found = true
+			d.SetValue([]byte(desc))
+		}
+
+		return found
+	})
+
+	if !found {
+		var d status.Detail
+
+		d.SetID(detailAccessDeniedDesc)
+		d.SetValue([]byte(desc))
+
+		st.AppendDetails(d)
+	}
+}
+
+// ReadAccessDeniedDesc looks up for status detail with human-readable description
+// of StatusAccessDenied. Returns empty string if detail is missing.
+func ReadAccessDeniedDesc(st status.Status) (desc string) {
+	st.IterateDetails(func(d *status.Detail) bool {
+		if d.ID() == detailAccessDeniedDesc {
+			desc = string(d.Value())
+			return true
+		}
+
+		return false
+	})
+
+	return
+}