chore(unstable): rename Deno.getUid() and Deno.getGid() (#16432)

This commit renames `Deno.getUid()` to `Deno.uid()` and renames
`Deno.getGid()` to `Deno.gid()`.

runtime/js/30_os.js

@@ -33,12 +33,12 @@
     return ops.op_network_interfaces();
   }
 
-  function getGid() {
-    return ops.op_getgid();
+  function gid() {
+    return ops.op_gid();
   }
 
-  function getUid() {
-    return ops.op_getuid();
+  function uid() {
+    return ops.op_uid();
   }
 
   // This is an internal only method used by the test harness to override the
@@ -101,13 +101,13 @@
     env,
     execPath,
     exit,
-    getGid,
-    getUid,
+    gid,
     hostname,
     loadavg,
     networkInterfaces,
     osRelease,
     setExitHandler,
     systemMemoryInfo,
+    uid,
   };
 })(this);