Large data warning should be on snackbar

[Jdaviz-Triage-Bot]

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Reporter: pllim

User is unable to see the "are you loading large data?" warning from glue in standalone mode. You can see it as warning under the viewer cell in notebook. User wants to see this warning emitted to snackbar instead so it is visible in standalone mode.

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DISCLAIMER: This issue was autocreated by the Jdaviz Issue Creation Bot on behalf of the reporter. If any information is incorrect, please contact Duy Nguyen