Add Adam* convenience constructors - #780

src/Torch/Optim.hs:119:17: error: [GHC-83865]
    • Couldn't match expected type ‘[Parameter] -> AdamW’
                  with actual type ‘Adam’
    • Possible cause: ‘mkAdam’ is applied to too many arguments
      In the expression: mkAdam 0 0.9 0.999 0.01
      In an equation for ‘mkDefaultAdam’:
          mkDefaultAdam = mkAdam 0 0.9 0.999 0.01
    |
119 | mkDefaultAdam = mkAdam 0 0.9 0.999 0.01
    |                 ^^^^^^^^^^^^^^^^^^^^^^^