[Spoolman] Support fetching filament information from spoolman

[tbe]

Is your feature request related to a problem? Please describe

I print some parts repeatedly with whatever filament i have at hand. Currently, i have to re slice every time with PA, Bed Temp and Heater temps.

Describe the solution you'd like

Spoolman supports settings_extruder_temp and settings_bed_temp nativly. Also, there is support for custom attributes (extra).

Fetching those informations and storing them as saved variables would allow access to them in the GCODE. This way, gcode files, saved on the virtual sd card, can be reused without the need of changing those files, editing configs, or re slicing everything.

Describe alternatives you've considered

Currently, i switch include files, one for each filament type by hand. This process is error prone.

Additional information

No response