Automatically try to load the Emterpreter data file

[curiousdannii]

This has been talked about, but I couldn't see an issue for it, so thought it would be good to make one for the sake of completeness.

If you're building to .js format, while the rest of the external files (.mem, .wasm) are loaded automatically, the emterpreter data file (.bin usually) is not. It would be nice if it was, and seeing as file loading is being thought about a lot at the moment now seems like an especially good time to raise this request.

Once change this may entail is changing from specifying the data file name/path to automatically generating the path.

Related: #5104, #5330, #5368, #5484

[stale]

This issue has been automatically marked as stale because there has been no activity in the past year. It will be closed automatically if no further activity occurs in the next 7 days. Feel free to re-open at any time if this issue is still relevant.