Merge `Module['parseTextWithFeatures']` into `Module['parseText']` (#8901)

deletes `Module['parseTextWithFeatures']` in favor of
`Module['parseText']` with an optional `features` parameter.

Any code calling the former should update accordingly.

Follow-up to
https://github.com/WebAssembly/binaryen/pull/8872#discussion_r3562364680