* Add get_recursion_available() and get_recursion_depth() functions
  to the test.support module.
* Change infinite_recursion() default max_depth from 75 to 100.
* Fix test_tomllib recursion tests for WASI buildbots: reduce the
  recursion limit and compute the maximum nested array/dict depending
  on the current available recursion limit.
* test.pythoninfo logs sys.getrecursionlimit().
* Enhance test_sys tests on sys.getrecursionlimit()
  and sys.setrecursionlimit().

Backport notes:

* Set support.infinite_recursion() minimum to 4 frames.
* test_support.test_get_recursion_depth() uses limit-2, apparently
  f-string counts for 2 frames in Python 3.11.
* test_sys.test_setrecursionlimit_to_depth() tests depth+2 instead of
  depth+1.

(cherry picked from commit 8ff1142)