Write macro placement position to a tcl file

[vijayank88]

Similar to write_pin_placement option, is there a option to write macro placement position while using automatic macro placement.
So that macro position will be re-used for some specific requirement with manual macro placement again.

[maliberty]

This is more of an issue than a discussion

[maliberty]

#5043

[AcKoucher]

@vijayank88 FYI, there's the write_macro_placement flag in mpl2. However it's currently deprecated due to a new OR command for general macro placement writing that was implemented in #4557.

I've opened #5046 to update the flag so that mpl2 will write the entire macro placement instead of only those macros that it placed.