Get a list of all custom fields by passing no Path Params. Pass the Path Param for getting particular
custom fields. Each custom field has the following keys

idAutoCustom Field ID.
ownerStringUser that is logged in.
nameStringName of custom field.
field_typeStringField type of the custom field.
cfmultichoiceListIf field_type is Multi-choice, It is the list of choices.
created_datedatetimeCreation date of the custom field.
updated_datedatetimeDate at which custom field is modified.
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