Feature: give the opportunity to explicitly pass the list of arguments to register

[pitx-perf]

Facing similar problems to: SciML/ModelingToolkit.jl#2251
and https://discourse.julialang.org/t/registering-functions-with-several-arguments-in-symbolics/96359

I wanted to register a function with a lot of arguments and explicitly provide the types instead of relying on the 'full factorial' approach.

using Symbolics

function my_calc(a, b, c, d)
    [a + b, c + d]
end

@register_array_symbolic my_calc(a, b, c, d) begin
    size = (2,)
end
# methods(my_calc)
# my_calc(a::Num, b::Num, c::Num, d::Num)
# my_calc(a::Num, b::Num, c::Num, d::SymbolicUtils.Symbolic{<:Real})
# my_calc(a::Num, b::Num, c::Num, d::Real)
# ...
# 81 methods

function my_calc2(a, b, c, d)
    a + b + c + d
end

@register_array_symbolic my_calc2(a, b, c, d) begin
    size = (2,)
end true true [(Num, Num, Num, Num), (Num, Num, Real, Real)]
# methods(my_calc2)
#  [1] my_calc2(a::Num, b::Num, c::Num, d::Num)
#  [2] my_calc2(a::Num, b::Num, c::Real, d::Real)
#  [3] my_calc2(a, b, c, d)
# 3 methods

[ChrisRackauckas]

Needs a test.