feat(api): extend commit and diff services with new functionality

- Add FindCommit, ListCommitsByOid, CommitIsAncestor RPCs to CommitService
- Add CheckObjectsExist, CommitsByMessage, GetCommitStats RPCs to CommitService
- Add LastCommitForPath, CountCommits, CountDivergingCommits RPCs to CommitService
- Add RawDiff, RawPatch, FindChangedPaths RPCs to DiffService
- Add FindMergeBase, WriteRef, SearchFilesByContent RPCs to RepositoryService
- Add SearchFilesByName, ObjectsSize, RepositorySize RPCs to RepositoryService
- Add FindLicense, OptimizeRepository, GetRawChanges RPCs to RepositoryService
- Add FetchRemote, CreateRepositoryFromURL RPCs to RepositoryService
- Implement server handlers for all new RPC methods
- Add new modules for commit counting, finding, and querying features
- Add new modules for diff changed paths and raw operations
- Add new modules for refs and remote operations
- Remove unnecessary comments from various source files
- Update proto definitions with new message types and service methods

proto/diff.proto

@@ -132,9 +132,67 @@ message GetDiffStatsRequest {
   DiffOptions options = 4;
 }
 
+
+message RawDiffRequest {
+  RepositoryHeader repository = 1;
+  string base = 2;       // revision or OID
+  string head = 3;
+  DiffOptions options = 4;
+}
+
+message RawDiffResponse {
+  bytes data = 1;
+}
+
+message RawPatchRequest {
+  RepositoryHeader repository = 1;
+  string base = 2;
+  string head = 3;
+}
+
+message RawPatchResponse {
+  bytes data = 1;
+}
+
+
+message FindChangedPathsRequest {
+  RepositoryHeader repository = 1;
+  string base = 2;
+  string head = 3;
+  repeated string paths = 4; // filter to these paths
+}
+
+message ChangedPath {
+  enum Status {
+    CHANGED_PATH_STATUS_UNSPECIFIED = 0;
+    CHANGED_PATH_STATUS_ADDED = 1;
+    CHANGED_PATH_STATUS_MODIFIED = 2;
+    CHANGED_PATH_STATUS_DELETED = 3;
+    CHANGED_PATH_STATUS_RENAMED = 4;
+    CHANGED_PATH_STATUS_COPIED = 5;
+    CHANGED_PATH_STATUS_TYPE_CHANGED = 6;
+  }
+
+  Status status = 1;
+  string old_path = 2;
+  string new_path = 3;
+  uint32 additions = 4;
+  uint32 deletions = 5;
+  bool binary = 6;
+}
+
+message FindChangedPathsResponse {
+  repeated ChangedPath paths = 1;
+}
+
 service DiffService {
   rpc GetDiff(GetDiffRequest) returns (GetDiffResponse);
   rpc GetCommitDiff(GetCommitDiffRequest) returns (GetDiffResponse);
   rpc GetPatch(GetPatchRequest) returns (stream GetPatchResponse);
   rpc GetDiffStats(GetDiffStatsRequest) returns (DiffStats);
+
+  rpc RawDiff(RawDiffRequest) returns (stream RawDiffResponse);
+  rpc RawPatch(RawPatchRequest) returns (stream RawPatchResponse);
+
+  rpc FindChangedPaths(FindChangedPathsRequest) returns (FindChangedPathsResponse);
 }