Type time validation of variable expressions

[Gobot1234]

📝 Description of the feature

Currently reals are typed as str | float. Initially when reading that I thought it might be a bug but I later remembered the existence of the constants you can enter.

I think the ideal solution from a typing perspective is to have a callback scope that produces the expression though I think that'd be very challenging to implement especially with all the binops and whatnot you'd need to support

💡 Steps for implementing the feature

I would imagine a lot of this needs autogenerating based on the version which will make things very challenging.

🔗 Useful links and references

No response

[Gobot1234]

Just spotted this in the examples

pump_head = solver.settings.setup.named_expressions.create("head")
pump_head.definition = "(({p-out} - {p-in}) / (998.2 [kg/m^3] * 9.81[m/s^2]))"
pump_head.output_parameter = True


###################################
# Define Report Definitions
# =================================

monitor = Monitor(solver)
report_definitions = ReportDefinitions(solver)

# Create a report definition
# p-out
outlet_pressure_report_def = report_definitions.surface.create("p-out")
outlet_pressure_report_def.report_type = "surface-massavg"
...
# p-in
inlet_pressure_report_def = report_definitions.surface.create("p-in")

Might not even need a callback scope in some situations

###################################
# Define Report Definitions
# =================================

monitor = Monitor(solver)
report_definitions = ReportDefinitions(solver)

# Create a report definition
# p-out
p_out = report_definitions.surface.create("p-out")
p_out.report_type = "surface-massavg"
...
# p-in
p_in = report_definitions.surface.create("p-in")

pump_head = solver.settings.setup.named_expressions.create("head")
pump_head.definition = (p_out - p_in) / (998.2 kg * m**-3 * 9.81 * m * s**-2))"
pump_head.output_parameter = True