Add new functionaly to MLCM package

[guillermoaguilar]

• parallel versions for boot and binom.diagnostics.

• wrapping already done in our gitlab repo by Joris
  https://git.tu-berlin.de/computational-psychology/surround_brightness/-/blob/main/surround_brightness/analysis/mlcm_functions.R?ref_type=heads

• get it from there and include it in MLCM R source code