cached_method: __name__ and __module__ attributes; callable as functions / class bound methods

[nthiery]

This ticket adds the following features to cached methods to make them
behave more like usual methods:

• __name__ and __module__ attributes

• calling them as functions / methods bound on a class:

  class Foo:
      @cached_method
      def f(self):
          ...
  
  sage: instance = Foo()
  sage: Foo.f(instance) is instance.f()
  sage: Foo.__dict__['f'](instance) is instance(f)
  

This makes them compatible with, e.g., deprecated_function_alias:

class Foo:
    @cached_method
    def f(self):
        ...
    bar = deprecated_function_alias(12963, f)

CC: @simon-king-jena

Component: misc

Author: Nicolas M. Thiéry

Branch: 6b18661

Reviewer: Simon King

Issue created by migration from https://trac.sagemath.org/ticket/15759

[nthiery]

Branch: public/ticket/15759

[nthiery]

Commit: 6b18661

[nthiery]

Reviewer: Simon King?

[nthiery]

New commits:

6b18661

Implementation of 15759

[nthiery]

Author: Nicolas M. Thiéry

[simon-king-jena]

comment:4

The code looks good, all tests pass, and in fact in the past I have considered to add the __name__ attribute myself. Positive review.

[simon-king-jena]

Changed reviewer from Simon King? to Simon King