Add Python support for set() function

[EmilyBourne]

Describe the feature

I would like to be able to use the set() function. This is important so that empty sets can be created. The set() function is different to the {,} function as it takes an iterable.

Test Code

Provide code which does not currently work but which should do when this issue is fixed:

if __name__ == '__main__':
    a = set([1,2,3])
    b = [4,5,6]
    c = set(b)
    d = set(c)

Proposed Solution

This feature should be implemented similarly to what was done for tuples. The equivalent issues for tuples was resolved in #1589.
The pertinent code is:

pyccel/pyccel/ast/builtins.py

Lines 596 to 620 in d64be7f

	class PythonTupleFunction(TypedAstNode):
	"""
	Class representing a call to the `tuple` function.
	Class representing a call to the `tuple` function. This is
	different to the `(,)` syntax as it only takes one argument
	and unpacks any variables.
	Parameters
	----------
	arg : TypedAstNode
	The argument passed to the function call.
	"""
	__slots__ = ()
	_attribute_nodes = ()
	def __new__(cls, arg):
	if isinstance(arg, PythonTuple):
	return arg
	elif isinstance(arg, (PythonList, InhomogeneousTupleVariable)):
	return PythonTuple(*arg)
	elif isinstance(arg.shape[0], LiteralInteger):
	return PythonTuple(*[arg[i] for i in range(arg.shape[0])])
	else:
	raise TypeError(f"Can't unpack {arg} into a tuple")

Additional context

It is important to handle the set function so that this function can be used for type annotations. If the {,} function is used bugs such as #1892 can arise.

[EmilyBourne]

cc: @mustapha-belbiad