Changes to Retrieve checkpoint

added the required property state/attestations to the response with the 200 status

added the required property state/childTarget to the response with the 200 status

added the required property state/depth to the response with the 200 status

added the required property state/difficulty to the response with the 200 status

added the required property state/elements to the response with the 200 status

added the required property state/foundationManagementAddress to the response with the 200 status

added the required property state/foundationSubsidyAddress to the response with the 200 status

added the required property state/index to the response with the 200 status

added the required property state/oakTarget to the response with the 200 status

added the required property state/oakTime to the response with the 200 status

added the required property state/oakWork to the response with the 200 status

added the required property state/prevTimestamps to the response with the 200 status

added the required property state/siafundTaxRevenue to the response with the 200 status

added the required property state/totalWork to the response with the 200 status

removed the required property state/attestations from the response with the 200 status

removed the required property state/childTarget from the response with the 200 status

removed the required property state/depth from the response with the 200 status

removed the required property state/difficulty from the response with the 200 status

removed the required property state/elements from the response with the 200 status

removed the required property state/foundationManagementAddress from the response with the 200 status

removed the required property state/foundationSubsidyAddress from the response with the 200 status

removed the required property state/index from the response with the 200 status

removed the required property state/oakTarget from the response with the 200 status

removed the required property state/oakTime from the response with the 200 status

removed the required property state/oakWork from the response with the 200 status

removed the required property state/prevTimestamps from the response with the 200 status

removed the required property state/siafundTaxRevenue from the response with the 200 status

removed the required property state/totalWork from the response with the 200 status