[JS API] Merge `Module['readBinaryWithFeatures']` into `Module['readBinary']` (#8954)

Removes method `binaryen.readBinaryWithFeatures()` in favor of
`binaryen.readBinary()`, which now supports a `features` parameter that
defaults to MVP if omitted.

This aligns cleanly with #8901, which removed `parseTextWithFeatures` in
favor of `parseText`.