add duplicate check to v2

[chdwlch]

Adds duplicate check. Uses continues to try again for random name generation.
Also did a fresh yarn install and i think it removed some old stuff

curl -X POST http://localhost:3000/v2/record -H "Content-Type: application/json" -d  '{"domain": "twelve.cash","lno": "lno1","userName": "furious.kite1"}'
{"message":"Bip353 Address Created","bip353":"[email protected]"}

curl -X POST http://localhost:3000/v2/record -H "Content-Type: application/json" -d  '{"domain": "twelve.cash","lno": "lno1","userName": "furious.kite1"}'
{"error":{"message":"Failed to update DNS record","errors":[{"message":"Name is already taken."}]}}

curl -X POST http://localhost:3000/v2/record -H "Content-Type: application/json" -d  '{"domain": "twelve.cash","lno": "lno12","userName": "furious.kite1"}'
{"error":{"message":"Failed to update DNS record","errors":[{"message":"Name is already taken."}]}}

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[sbddesign]

LGTM