Set a typeahead delay to prevent overloading server

[icarito]

This is meant to alleviate #4661 perhaps avoid recent outages caused by it!

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[icarito]

I speculated 350 to be a bit short so I set it to 450. Better be safe, as this affects all users not just the ones searching!

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[icarito]

We had another slowdown / brief outage. Could we merge/deploy this? If it happens again I might deploy it as a hotfix.

[jywarren]

Thanks, @icarito i'm traveling now so didn't see this. Merged and thanks -- remaining tasks for optimizing are listed at:

• Explore request timing optimizations for typeahead search and username/tag autocompletion #3472
• Slow API requests for /api/srch/profiles?query= #4670 (comment)