feat: request anomaly detection

[blackmad]

I was getting this error from DDG when I didn't sleep in between three requests, and was getting a nasty exception from a regex rather than a nice helpful error

/Users/blackmad/Code/md-googlify/node_modules/duck-duck-scrape/lib/search/search.js:80
    const searchResults = JSON.parse(SEARCH_REGEX.exec(response.body.toString())[1].replace(/\t/g, '    '));

this is the error I discovered in the body (that was also a buffer, not a string)

 body: "DDG.deep.anomalyDetectionBlock({gk:'nac7b3a5f507fb907b94049aa855db990',q:'Friche%20la%20Belle%20de%20Mai',iadb:1,sc:1,e:0,p:'80-386-283-234-262-245-251-127-263',cc:'sre',o:'lTCdmsFCzbUSUhPvj7hnXN%2BlaWGPLfIPMY%2F0kNT0Tzw%3D%0A',er:'',s:'index', r:'euw'})",