Rename service handlers (#4571)

Rename these handlers to be base<Service>Handler so that we get some segmentation of functionality. This will allow us a bit of compile-time safety when it comes to accessing graph because the base handler doesn't contain a client instance. Essentially it allows us local access to things for operations like restore.

Future additions to the handler that require a client should wrap this base handler to provide that functionality. Export functions shouldn't be updated to be part of the new handler wrapper but should stay as part of the base handler so they continue to not have access to graph.

---

#### Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No

#### Type of change

- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [x] 🧹 Tech Debt/Cleanup

#### Issue(s)

* #4254

#### Test Plan

- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E

src/internal/m365/service/groups/export.go

@@ -19,26 +19,26 @@ import (
 	"github.com/alcionai/corso/src/pkg/path"
 )
 
-var _ inject.ServiceHandler = &groupsHandler{}
+var _ inject.ServiceHandler = &baseGroupsHandler{}
 
 func NewGroupsHandler(
 	opts control.Options,
-) *groupsHandler {
+) *baseGroupsHandler {
-	return &groupsHandler{
+	return &baseGroupsHandler{
 		opts:               opts,
 		backupDriveIDNames: idname.NewCache(nil),
 		backupSiteIDWebURL: idname.NewCache(nil),
 	}
 }
 
-type groupsHandler struct {
+type baseGroupsHandler struct {
 	opts control.Options
 
 	backupDriveIDNames idname.CacheBuilder
 	backupSiteIDWebURL idname.CacheBuilder
 }
 
-func (h *groupsHandler) CacheItemInfo(v details.ItemInfo) {
+func (h *baseGroupsHandler) CacheItemInfo(v details.ItemInfo) {
 	if v.Groups == nil {
 		return
 	}
@@ -49,7 +49,7 @@ func (h *groupsHandler) CacheItemInfo(v details.ItemInfo) {
 
 // ProduceExportCollections will create the export collections for the
 // given restore collections.
-func (h *groupsHandler) ProduceExportCollections(
+func (h *baseGroupsHandler) ProduceExportCollections(
 	ctx context.Context,
 	backupVersion int,
 	exportCfg control.ExportConfig,

src/internal/m365/service/onedrive/export.go

@@ -15,25 +15,25 @@ import (
 	"github.com/alcionai/corso/src/pkg/path"
 )
 
-var _ inject.ServiceHandler = &onedriveHandler{}
+var _ inject.ServiceHandler = &baseOnedriveHandler{}
 
 func NewOneDriveHandler(
 	opts control.Options,
-) *onedriveHandler {
+) *baseOnedriveHandler {
-	return &onedriveHandler{
+	return &baseOnedriveHandler{
 		opts: opts,
 	}
 }
 
-type onedriveHandler struct {
+type baseOnedriveHandler struct {
 	opts control.Options
 }
 
-func (h *onedriveHandler) CacheItemInfo(v details.ItemInfo) {}
+func (h *baseOnedriveHandler) CacheItemInfo(v details.ItemInfo) {}
 
 // ProduceExportCollections will create the export collections for the
 // given restore collections.
-func (h *onedriveHandler) ProduceExportCollections(
+func (h *baseOnedriveHandler) ProduceExportCollections(
 	ctx context.Context,
 	backupVersion int,
 	exportCfg control.ExportConfig,

src/internal/m365/service/sharepoint/export.go

@@ -17,23 +17,23 @@ import (
 	"github.com/alcionai/corso/src/pkg/path"
 )
 
-var _ inject.ServiceHandler = &sharepointHandler{}
+var _ inject.ServiceHandler = &baseSharepointHandler{}
 
 func NewSharePointHandler(
 	opts control.Options,
-) *sharepointHandler {
+) *baseSharepointHandler {
-	return &sharepointHandler{
+	return &baseSharepointHandler{
 		opts:               opts,
 		backupDriveIDNames: idname.NewCache(nil),
 	}
 }
 
-type sharepointHandler struct {
+type baseSharepointHandler struct {
 	opts               control.Options
 	backupDriveIDNames idname.CacheBuilder
 }
 
-func (h *sharepointHandler) CacheItemInfo(v details.ItemInfo) {
+func (h *baseSharepointHandler) CacheItemInfo(v details.ItemInfo) {
 	// Old versions would store SharePoint data as OneDrive.
 	switch {
 	case v.SharePoint != nil:
@@ -46,7 +46,7 @@ func (h *sharepointHandler) CacheItemInfo(v details.ItemInfo) {
 
 // ProduceExportCollections will create the export collections for the
 // given restore collections.
-func (h *sharepointHandler) ProduceExportCollections(
+func (h *baseSharepointHandler) ProduceExportCollections(
 	ctx context.Context,
 	backupVersion int,
 	exportCfg control.ExportConfig,