Enable layer numbers based elimination from input arguments

[snoop2head]

• Currently supports output channel based elimination
• In order to fulfill the goal of lightweight model(less layers and less FLOPS), enable layer numbers based elimination for each pretrained models
• It is observed that deleting more than 4 convolutional blocks on pretrained efficientnetb0 and on mobilenet_v3_large degrades models' performance.

[snoop2head]

VGG13 elimination method can be based on layer numbers