Add curses.term_attrs()

[serhiy-storchaka]

Feature or enhancement

The :mod:curses module exposes :func:curses.termattrs, which returns the logical OR of all video attributes supported by the terminal as a chtype (the A_* attributes), but not its X/Open counterpart term_attrs().

term_attrs() returns the same information as an attr_t value, that is, in terms of the WA_* extended attributes (added in gh-152219).

Proposed API:

• curses.term_attrs() -> int

The result pairs with the WA_* constants, for example curses.term_attrs() & curses.WA_BOLD.

Linked PRs

• gh-152332: Add the curses.term_attrs() function #152333