feat(init): Use jsonc for configuration file (#17002)

Generate "deno.jsonc" instead of "deno.json" when running "deno init"
subcommand.

cli/tests/init_tests.rs

@@ -31,7 +31,7 @@ mod init {
     assert_contains!(stderr, "deno task dev");
     assert_contains!(stderr, "deno test");
 
-    assert!(cwd.join("deno.json").exists());
+    assert!(cwd.join("deno.jsonc").exists());
 
     let mut deno_cmd = util::deno_cmd_with_deno_dir(&deno_dir);
     let output = deno_cmd
@@ -86,7 +86,7 @@ mod init {
     assert_contains!(stderr, "deno task dev");
     assert_contains!(stderr, "deno test");
 
-    assert!(cwd.join("my_dir/deno.json").exists());
+    assert!(cwd.join("my_dir/deno.jsonc").exists());
 
     let mut deno_cmd = util::deno_cmd_with_deno_dir(&deno_dir);
     let output = deno_cmd
@@ -137,7 +137,7 @@ mod init {
     assert!(output.status.success());
     let stdout = String::from_utf8(output.stdout).unwrap();
     assert_eq!(stdout, "");
-    assert!(cwd.join("deno.json").exists());
+    assert!(cwd.join("deno.jsonc").exists());
 
     let mut deno_cmd = util::deno_cmd_with_deno_dir(&deno_dir);
     let output = deno_cmd

cli/tools/init/mod.rs

@@ -41,7 +41,7 @@ pub async fn init_project(init_flags: InitFlags) -> Result<(), AnyError> {
     .replace("{CURRENT_STD_URL}", deno_std::CURRENT_STD_URL.as_str());
   create_file(&dir, "main_test.ts", &main_test_ts)?;
 
-  create_file(&dir, "deno.json", include_str!("./templates/deno.json"))?;
+  create_file(&dir, "deno.jsonc", include_str!("./templates/deno.jsonc"))?;
 
   info!("✅ {}", colors::green("Project initialized"));
   info!("");