basic interface to Risa/Asir

[fchapoton]

tentative to make a working interface to risa/asir

https://github.com/openxm-org/OpenXM

this is based on the file OpenXM/src/sage/asir.py there, currently broken

📝 Checklist

• The title is concise and informative.
• The description explains in detail what this PR is about.
• I have linked a relevant issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation and checked the documentation preview.

⌛ Dependencies

[fchapoton]

to identify the type of objects, one could use type(a) which returns an integer

see http://www.math.kobe-u.ac.jp/OpenXM/Current/doc/asir2000/html-en/man/man_16.html#Types-in-Asir

[github-actions]

Documentation preview for this PR (built with commit d397067; changes) is ready! 🎉
This preview will update shortly after each push to this PR.

[fchapoton]

I have an annoying failure about pickling and LazyImport, but this works for other interfaces. Any idea on how to fix that ?

[nobuki-takayama]

A = asir('[1,2.3*@i,4.5]'); A.sage()
[1, 2.30000000000000*I, 4.50000000000000]
now works. See
https://github.com/openxm-org/OpenXM/commit/2061788bc47144bc6893fb1adbc753daabde1e3b