[3.13] gh-151471: Colorize the soft keyword type in IDLE (GH-151700)

[serhiy-storchaka]

type is now colored as a keyword when it starts a statement and is followed by a name, as in type Point = tuple[float, float]. It stays a builtin elsewhere, for example in type = type(1), type(x) or type in (int, str).

(cherry picked from commit 68ed7a5)

Manual backport: test_recolorize_main asserts tags at absolute line numbers, and the colorizer colorizes in chunks whose size doubles, so which chunk a line falls into depends on how many lines precede it. This branch has one line fewer in the test source, and the new type line ends up in a chunk which starts inside the unterminated string above it. Instead of the two lines there, this adds test_type_soft_keyword, which checks the tag ranges of separate snippets.

Co-authored-by: Shixian Li znsoooo@gmail.com

• Issue: IDLE - colorize type as a soft keyword when it begins a statememt #151471