LowMemoryLimit was originally introduced for embedded devices with very limited RAM for which even a single 64k bytes (single page) was not possible

This pr want to let this limitation available for some larger ram devices.
some rumtime like v8 will not allocate memory when memory grow. instead, they will allocate when memory is used.

for example, some embedden devices have 1MB ram, but still not enough to run multiple wasm together. it is good to use this option to limit ram usage less than e.g. 1.5 wasm pages.

This PR has been automatically marked as stale because it has not had recent activity. It will be closed in one week if no further activity occurs. Thank you for your contributions!

This PR has been automatically closed due to lack of recent activity, but feel free to reopen it as long as you merge in the main branch afterwards.

For the record, we should opt to use custom-page-sizes when support is added in Binaryen.