feat(repodb): add user related information to repodb (#1317)

Initial code was contributed by Bogdan BIVOLARU <104334+bogdanbiv@users.noreply.github.com>
Moved implementation from a separate db to repodb by Andrei Aaron <aaaron@luxoft.com>

Not done yet:
- run/test dynamodb implementation, only boltdb was tested
- add additional coverage for existing functionality
- add web-based APIs to toggle the stars/bookmarks on/off

Initially graphql mutation was discussed for the missing API but
we decided REST endpoints would be better suited for configuration



feat(userdb): complete functionality for userdb integration

- dynamodb rollback changes to user starred repos in case increasing the total star count fails
- dynamodb increment/decrement repostars in repometa when user stars/unstars a repo
- dynamodb check anonymous user permissions are working as intendend
- common test handle anonymous users
- RepoMeta2RepoSummary set IsStarred and IsBookmarked



feat(userdb): rest api calls for toggling stars/bookmarks on/off



test(userdb): blackbox tests



test(userdb): move preferences tests in a different file with specific build tags



feat(repodb): add is-starred and is-bookmarked fields to repo-meta

- removed duplicated logic for determining if a repo is starred/bookmarked

Signed-off-by: Laurentiu Niculae <niculae.laurentiu1@gmail.com>
Co-authored-by: Andrei Aaron <aaaron@luxoft.com>

pkg/api/constants/extensions.go

@@ -5,8 +5,11 @@ const (
 	ExtCatalogPrefix     = "/_catalog"
 	ExtOciDiscoverPrefix = "/_oci/ext/discover"
 	// zot specific extensions.
-	ExtSearchPrefix  = "/_zot/ext/search"
-	FullSearchPrefix = RoutePrefix + ExtSearchPrefix
-	ExtMgmtPrefix    = "/_zot/ext/mgmt"
-	FullMgmtPrefix   = RoutePrefix + ExtMgmtPrefix
+	ExtPrefix                 = "/_zot/ext"
+	ExtSearchPrefix           = ExtPrefix + "/search"
+	FullSearchPrefix          = RoutePrefix + ExtSearchPrefix
+	ExtMgmtPrefix             = ExtPrefix + "/mgmt"
+	FullMgmtPrefix            = RoutePrefix + ExtMgmtPrefix
+	ExtUserPreferencesPrefix  = ExtPrefix + "/userprefs"
+	FullUserPreferencesPrefix = RoutePrefix + ExtUserPreferencesPrefix
 )