Support creating tasks from builders

[GeigerJ2]

Currently, only nested dictionaries can be used to populate the parameters of a task. Support setting also from a builder (similar to submit in AiiDA, where you can provide either the class and the input parameters, or the builder).

As noted by @rikigigi, who had to first convert the builder data to a nested dictionary.

[superstar54]

Hi @GeigerJ2 , thanks for taking care of this issue. Setting task inputs from the builder is now supported in the set_from_builder method, but creating tasks from the builder has not been implemented yet.

I think we want to support syntax similar to the following code:

from aiida.calculations.arithmetic.add import ArithmeticAddCalculation
from aiida_workgraph import WorkGraph
from aiida import orm

builder = ArithmeticAddCalculation.get_builder()
builder.code = code
builder.x = orm.Int(2)
builder.y = orm.Int(3)

wg = WorkGraph("test_set_inputs_from_builder")
# use builder to create task
add1 = wg.add_task(builder, name="add1")