commit-graph: emit trace2 cmd_mode for each sub-command

Emit trace2_cmd_mode() messages for each commit-graph
sub-command.

The commit graph commands were in flux when trace2 was
making it's way to git. Now that we have enough sub-commands
in commit-graph, we can label the various modes within them.
Distinguishing between read, write and verify is a great
start.

Signed-off-by: Garima Singh <[email protected]>
Acked-by: Jeff Hostetler <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: garimasi514

builtin/commit-graph.c

@@ -58,6 +58,8 @@ static int graph_verify(int argc, const char **argv)
 		OPT_END(),
 	};
 
+	trace2_cmd_mode("verify");
+
 	argc = parse_options(argc, argv, NULL,
 			     builtin_commit_graph_verify_options,
 			     builtin_commit_graph_verify_usage, 0);
@@ -102,6 +104,8 @@ static int graph_read(int argc, const char **argv)
 		OPT_END(),
 	};
 
+	trace2_cmd_mode("read");
+
 	argc = parse_options(argc, argv, NULL,
 			     builtin_commit_graph_read_options,
 			     builtin_commit_graph_read_usage, 0);
@@ -183,6 +187,8 @@ static int graph_write(int argc, const char **argv)
 	split_opts.max_commits = 0;
 	split_opts.expire_time = 0;
 
+	trace2_cmd_mode("write");
+
 	argc = parse_options(argc, argv, NULL,
 			     builtin_commit_graph_write_options,
 			     builtin_commit_graph_write_usage, 0);