Add ordering for list methods (#39)

Add `order_desc` bool to list methods for ordering.

buf/registry/module/v1beta1/branch_service.proto

@@ -86,6 +86,8 @@ message ListBranchesRequest {
   //   - Is a Branch is referenced, this Branch is returned.
   //   - If a Digest is referenced, all Branches that contain a Commit with this Digest are returned.
   ResourceRef resource_ref = 3 [(buf.validate.field).required = true];
+  // Whether to sort the Branches in descending order.
+  bool sort_desc = 4;
 }
 
 message ListBranchesResponse {

buf/registry/module/v1beta1/commit_service.proto

@@ -119,6 +119,8 @@ message ListCommitHistoryRequest {
   bool has_tag = 4;
   // Only return Commits that have one or more associated VCSCommits.
   bool has_vcs_commit = 5;
+  // Whether to sory the Commits in descending order.
+  bool sort_desc = 6;
 }
 
 message ListCommitHistoryResponse {

buf/registry/module/v1beta1/module_service.proto

@@ -82,6 +82,8 @@ message ListModulesRequest {
   // If empty, all Modules for all owners are listed, but this functionality
   // is limited to Users with the necessary permissions.
   repeated buf.registry.owner.v1beta1.OwnerRef owner_refs = 3;
+  // Whether to sort the Modules in descending order.
+  bool sort_desc = 4;
 }
 
 message ListModulesResponse {

buf/registry/module/v1beta1/tag_service.proto

@@ -81,6 +81,8 @@ message ListTagsRequest {
   //   - Is a Branch is referenced, all Tags for Commits on the Branch are returned.
   //   - If a Digest is referenced, all Tags that contain a Commit with this Digest are returned.
   ResourceRef resource_ref = 3 [(buf.validate.field).required = true];
+  // Whether to sort the Tags in descending order.
+  bool sort_desc = 4;
 }
 
 message ListTagsResponse {

buf/registry/module/v1beta1/vcs_commit_service.proto

@@ -78,4 +78,6 @@ message ListVCSCommitsResponse {
   string next_page_token = 1 [(buf.validate.field).string.max_len = 4096];
   // The listed VCSCommits.
   repeated VCSCommit vcs_commits = 2;
+  // Whether to sort the VCSCommits in descending order.
+  bool sort_desc = 4;
 }

buf/registry/owner/v1beta1/organization_service.proto

@@ -79,6 +79,8 @@ message ListOrganizationsRequest {
   // If this is empty, all Organizations are listed, but this functionality
   // is limited to Users with the necessary permissions.
   repeated UserRef user_refs = 3;
+  // Whether to sort the Organizations in descending order.
+  bool sort_desc = 4;
 }
 
 message ListOrganizationsResponse {

buf/registry/owner/v1beta1/user_service.proto

@@ -82,6 +82,8 @@ message ListUsersRequest {
   // If this is empty, all Users for all Organizations are listed, but this functionality
   // is limited to Users with the necessary permissions.
   repeated OrganizationRef organization_refs = 3;
+  // Whether to sort the Users in descending order.
+  bool sort_desc = 4;
 }
 
 message ListUsersResponse {