Enhance input shaper support for dual carriage printers

[rogerlz]

This PR introduces support for multiple input shaper parameter sets in dual carriage (IDEX) printers.

• dual carriage input shaper:
  Allows configuration of distinct input shaper parameters (type, frequency, and damping ratio) for each toolhead in PRIMARY mode, as well as separate values for COPY and MIRROR modes, via comma-separated lists in the [input_shaper] section.

• dynamic parameter switching:
  Automatically applies the correct input shaper parameters when switching toolheads.

• g-code enhancements:
  -- Adds a TOOLHEAD parameter to the SET_INPUT_SHAPER command.
  -- Introduces a new GET_INPUT_SHAPER command to query the currently active input shaper settings and all configured values.

It is backwards compatible, so it doesn't impact existing configurations.

[rogerlz]

[input_shaper]
shaper_freq_x: 40.2, 42
shaper_freq_y: 57.4, 55
shaper_type_x: ei, mzv
shaper_type_y: 2hump_ei, 2hump_ei
damping_ratio_x: 0.062, 0.062
damping_ratio_y: 0.066, 0.066

[rogerlz]

[input_shaper]
shaper_freq_x: 40.2, 42, 44, 45
shaper_freq_y: 57.4, 55, 58, 59
shaper_type_x: ei, mzv, zv, zv
shaper_type_y: 2hump_ei, 2hump_ei, zv, zv
damping_ratio_x: 0.062
damping_ratio_y: 0.066