Changes to Search federal dockets and filings

the offset request property's max was set to 200.00

removed the non-success response with the status 501

added the new optional request property acknowledgePacerFees

added the non-success response with the status 429

added the non-success response with the status 501

added the optional property live to the response with the 200 status

added the optional property pacerFees to the response with the 200 status