Add a stylistic set to enable Haskell bind operators (`>>=` and `=<<`)

[bodby]

Description of the new feature/enhancement (with images if possible)

Version 2106.17 removed the >>= and =<< ligatures, but they are still accessible by adding an extra equal (>>- and -<< still exist, though).

Would it be possible to instead have a stylistic set that enables these ligatures again, without the need for the extra character? Something like ss02 which modifies the ~= ligature.

Proposed technical implementation details (optional)

An ss04 stylistic set to enable >>= and =<<. Not enabling it keeps the JS shift operator as-is.