feat(tree): add recent commit metadata and LFS support to file metadata

- Added RecentCommit message definition with oid, subject and timestamp fields
- Extended TreeEntry, Tree, and FileMetadata messages with is_lfs and recent_commit fields
- Updated get_file_metadata function to include recent commit information
- Added tree module import and recent_commit lookup functionality
- Updated protobuf definitions to include new metadata fields
- Enhanced file metadata response with LFS status and commit history

proto/tree.proto

@@ -5,6 +5,12 @@ package gitks;
 import "oid.proto";
 import "repository.proto";
 
+message RecentCommit {
+  Oid oid = 1;
+  string subject = 2;
+  int64 committed_timestamp = 3;
+}
+
 message TreeEntry {
   enum EntryType {
     TREE_ENTRY_TYPE_UNSPECIFIED = 0;
@@ -21,6 +27,8 @@ message TreeEntry {
   EntryType type = 4;
   uint32 mode = 5;
   int64 size = 6;
+  bool is_lfs = 7;
+  RecentCommit recent_commit = 8;
 }
 
 message Tree {
@@ -39,6 +47,8 @@ message Blob {
   string encoding = 6;
   bool binary = 7;
   bool truncated = 8;
+  bool is_lfs = 9;
+  RecentCommit recent_commit = 10;
 }
 
 message FileMetadata {
@@ -48,6 +58,8 @@ message FileMetadata {
   int64 size = 4;
   ObjectType type = 5;
   bool binary = 6;
+  bool is_lfs = 7;
+  RecentCommit recent_commit = 8;
 }
 
 message ListTreeRequest {