Remove mjTIMER_ACCELERATION, add mjTIMER_ADVANCE.

- mjTIMER_ACCELERATION is not very useful, it's usually very tiny (0.5% for humanoid, 1% for 22humanoids). It basically times a single call to `mj_solveM`.

- Added `mjTIMER_ADVANCE` to time `mj_Euler` and `mj_implicit` (which can be significant).

- Moved `mj_transmission` to `mjTIMER_KINEMATICS` where it belongs (and used to be).

PiperOrigin-RevId: 565936880
Change-Id: I26b8a067133594e5500ca1c809beb3518b4a8d9c

sample/testspeed.cc

@@ -239,7 +239,7 @@ int main(int argc, char** argv) {
 
         // save step time, add up timing of components
         if (i == 0) total = istep;
-        if (i >= mjTIMER_POSITION && i <= mjTIMER_CONSTRAINT) {
+        if (i >= mjTIMER_POSITION && i <= mjTIMER_ADVANCE) {
           components += istep;
         }
       }