[GRT] Change RC debug precision; Add debug print
[GRT] Change RC debug precision; Add debug print

This change enables more accurate RC correlation

Signed-off-by: Austin Rovinski <fcf2266bfbf73692490c0038f6d4290540d21769@umich.edu>

The-OpenROAD-Project/OpenROAD,The-OpenROAD-Project/OpenROAD,The-OpenROAD-Project/OpenROAD,QuantamHD/OpenROAD,QuantamHD/OpenROAD,The-OpenROAD-Project/OpenROAD,QuantamHD/OpenROAD,QuantamHD/OpenROAD,QuantamHD/OpenROAD,The-OpenROAD-Project/OpenROAD