Changes to Hidden gems: consistent mid-size winners

the response property items/firstTradeAt became nullable for the status 200

the response property items/largestLoss became nullable for the status 200

the response property items/largestWin became nullable for the status 200

the response property items/lastTradeAt became nullable for the status 200

the response property items/totalFees became nullable for the status 200

for the query request parameter limit, the max was set to 100.00

for the query request parameter minWinRate, the max was set to 100.00

for the query request parameter limit, the min was set to 1.00

for the query request parameter maxTrades, the min was set to 1.00

for the query request parameter minTrades, the min was set to 1.00

for the query request parameter minWinRate, the min was set to 0.00

removed the optional property items/$schema from the response with the 200 status

added the new optional query request parameter minActiveDays

added the new optional query request parameter minDistinctCoins

added the non-success response with the status 403

removed the non-success response with the status 401

added the optional property reason to the response with the 400 status

added the optional property reason to the response with the 422 status

added the optional property reason to the response with the 429 status

added the optional property reason to the response with the 500 status

added the optional property reason to the response with the 504 status

added the required property items/activeDays to the response with the 200 status

added the required property items/distinctCoins to the response with the 200 status