proposal-error-stacks: Option to forge an error's stack trace

It’d be useful for error reporting to be able to forge an error’s stack trace, for cases like:

• Serializing errors across thread/process boundaries (HTML’s spec could add error serialization to their structured clone algorithm)
• Sanitizing a stack trace for security reasons (for example, Caja)
• Language VMs like Ember’s Glimmer or Moonshine could have a dev mode that provides better stack traces to JS than what you’d get otherwise (a lot of hardly-useful internal calls)

Currently, no engine provides this facility, but V8 does support a restricted form via Error.captureStackTrace, but it’s limited to functions within the actual call stack and just trimming from the top, rather than allowing arbitrary modifications.