GitLab::Projects: Add project_export*() methods

GitLab/Projects.pm

@@ -373,6 +373,25 @@ my $requests = {
             namespace
         )],
     },
+
+    project_export => {
+        method      => 'POST',
+        path        => '/projects/<id>/export',
+        optional    => [qw(
+            description
+        )],
+    },
+
+    project_export_status => {
+        method      => 'GET',
+        path        => '/projects/<id>/export',
+    },
+
+    project_export_download => {
+        method      => 'GET',
+        path        => '/projects/<id>/export/download',
+        download    => 1,
+    },
 };
 
 sub import {