Random for sub-blocks

[miasik]

Doing elemental mergings we can use grouping feature in the Elemental window, something like this:

cond_stage_model.transformer.text_model.encoder.layers.1.::0.8
cond_stage_model.transformer.text_model.encoder.layers.3.::0.9
cond_stage_model.transformer.text_model.encoder.layers.4.::0.78
cond_stage_model.transformer.text_model.encoder.layers.6.::0.7
cond_stage_model.transformer.text_model.encoder.layers.7.::0.33
cond_stage_model.transformer.text_model.encoder.layers.9.::0.3
cond_stage_model.transformer.text_model.encoder.layers.10.::0.2
cond_stage_model.transformer.text_model.encoder.layers.11.::0.1

I'd love to have the next new feature for random:

cond_stage_model.transformer.text_model.encoder.layers.0.::BR,0,1
cond_stage_model.transformer.text_model.encoder.layers.1.::ER,0.5,1

BR means Block Randomization and uses the same value for all the elements within.
ER means Elemental Randomization and uses individual values for each element within.
Numbers - min and max values for a randomization function.