Fix duplicate txt record

[chdwlch]

• Removed DO code
• Added a step to check for an existing record via CloudFlare DoH before attempting to create the record
• Returns a 409 in the creation attempt instead of 400 if a duplicate is found at that point

fix-duplicates-v1

#initial creation
curl -X POST http://localhost:3000/record -H "Content-Type: application/json" -d  '{"localPart": "cw-test-70", "bolt12": "lno...."}'
{"message":"Bolt12 Address Created"}

# same name and values
curl -X POST http://localhost:3000/record -H "Content-Type: application/json" -d  '{"localPart": "cw-test-70", "bolt12": "lno...."}'
{"message":"Name is already taken."}

# same name different values
curl -X POST http://localhost:3000/record -H "Content-Type: application/json" -d  '{"localPart": "cw-test-70", "bolt12": "lno....zzz"}'
{"message":"Name is already taken."}

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[chdwlch]

Issue with DoH lookup is that there is a delay before the records are propagated... There is about 5 seconds before the duplicate check there will work