Print `code_typed`-friendly signature for the current frame

If Cthulhu gives some questionable results, it's often useful to confirm against code_typed. This can be difficult to do if the current frame is deep in the call stack and/or has many arguments/is a keyword call. For example, this signature came up from a keyword call in ModelingToolkit.jl

var"#System#536"(constraints, noise_eqs, jumps, costs, consolidate, observed, bindings, initial_conditions, guesses, systems, initialization_eqs, continuous_events, discrete_events, connector_type, assertions, metadata, gui_metadata, is_dde, tstops, inputs, outputs, tearing_state, ignored_connections, parent, description, name, discover_from_metadata, initializesystem, is_initializesystem, is_discrete, preface, checks, __legacy_defaults__, ::Type{System}, eqs::Vector{Equation}, iv, dvs, ps, brownians)

The above is the signature that Cthulhu prints for the method. Could there be an option to display code_typed-friendly syntax with fully-qualified types to allow copy-pasting it into code_typed?

Start by locating the code that prints the current frame's method signature in Cthulhu.jl, then compare its output with the syntax accepted by Julia's code_typed. Define the option's expected output using the keyword-call example in the issue; done when a displayed signature can be copied into code_typed with fully qualified types.