feat(input): add echo file option for layered input parameters

[mjreno]

Create an echo file for numeric array input

• currently supported only for input parameters that support LAYERED
• option follows variable name and LAYERED if provided:
  • top ECHO
  • botm LAYERED ECHO
• Output arrays structured according to input parameter dfn type
• 3d types written to separate layer files
• File naming convention currently set as <component>-<subcomponent>.varname[.layer].txt, for example:
  • CSUB_DIS-DIS.botm.l1.txt, CSUB_DIS-NPF.k33.txt
  • FLOW-NPF.icelltype.txt