further improvement to loading time

[thautwarm]

As a Python user, one second loading time for a small project is painful.

I'm testing a very small example as follows:

module mylib
using TyPython
using TyPython.CPython

@export_py function sum_along_indices(array::Vector{Cdouble}, indices::Vector{Int32})::Cdouble
    s = zero(Cdouble)
    for i in indices
        s += array[i + 1]
    end
    return s
end


@export_py function add(a::Int, b::Int)::Int
    a + b
end


function init()
    @export_pymodule _mylib begin
        sum_along_indices = Pyfunc(sum_along_indices)
        add = Pyfunc(add)
    end
end

precompile(init, ())
end

This seems to be the theoretically fastest loading time:

julia> @time begin import Pkg, TyPython; TyPython.CPython.init()
       Pkg.activate("mylib"); import mylib; TyPython.CPython.init();mylib.init()
       end
  Activating project at `C:\Users\TR\Desktop\demo\mylib\mylib`
  0.973526 seconds (1.72 M allocations: 100.042 MiB, 2.27% gc time, 70.02% compilation time)
Py(namespace(sum_along_indices=<built-in function sum_along_indices>, add=<built-in function add>))

So far the extra overhead comes from the following parts, which can be optimized in the future:

1. calling interpreted julia to get configuration:

   jnumpy/jnumpy/init.py

   Lines 112 to 117 in 669e046

   	cmd = [
   	SessionCtx.JULIA_EXE,
   	jl_opts_proj,
   	*jl_opts,
   	"--startup-file=no",
   	"-O0",

2. calling interpreted julia to get the module name:

   jnumpy/jnumpy/apis.py

   Line 92 in 669e046

   jl_module_name = get_project_name_checked(project_dir)

[songjhaha]

Using python's toml to parse a Project.toml would be better here:

jnumpy/jnumpy/apis.py

Line 80 in 58d3a29

jl_module_name = get_project_name_no_exc(project_dir)

It cost 0.1s to get project name while init_project() cost 0.9s on my computer.

[thautwarm]

Fine, we could use toml at this stage.