v8.32.0

ModelingToolkit v8.32.0

Diff since v8.31.0

Closed issues:

• Extending the metadata system from Symbolics to AbstractSystem (#1039)
• ERROR: LoadError: UndefVarError: handle_varmap not defined (#1924)

Merged pull requests:

• forward tspan in modelingtoolkitize (#1921) (@anandijain)
• make add_input_disturbance handle MIMO systems (#1923) (@baggepinnen)
• Add structural_simplify support for OptimizationSystem (#1926) (@YingboMa)
• Add observed support for optimization systems (#1927) (@YingboMa)