[BUG] Entrypoint parameters are not converted properly from strings to their correct type

[jtsextonMITRE]

Currently the entrypoint endpoint only allows strings to be uploaded for the default parameters (as it should). However, by the time it gets passed to the task engine, these values haven't been converted to their proper types the task engine throws an error for anything not typed as a string.

For example '[28,28,1]' -> [28, 28, 1].