Add explicit List to Range and Singular scan-parameter specifictions

[g5t]

In the scan parameter parser only range specifications, e.g., par=first:step:last, or singular specifications, e.g., par=value, are supported.

mccode-antlr/src/mccode_antlr/run/range.py

Lines 220 to 226 in bf76294

	def parse_scan_parameters(unparsed: list[str]) -> dict[str, MRange | Singular]:
	"""Parse a list of input parameters into a dictionary of MRange or Singular objects.
	:parameter unparsed: A list of parameters.
	:return: A dictionary of MRange or Singular objects. The Singular objects have their maximum length set to the
	maximum iterations of all the ranges to avoid infinite iterations.
	"""

This can be limiting if, e.g., a non-linear scan is required.

To support such a possibility, the parser should be modified to include, e.g., par=first,second,third,fourth,...,last, explicit list parsing.