Add DynamoDB support

[johnweland]

Add AWS DynamoDB support.

Schedule a function to loop over the (Firehol blocklist-ipsets)[https://github.com/firehol/blocklist-ipsets], extract the ip addresses as we are already doing in the current ipcheck function. Then compare those IP addresses and their corresponding file as key:value pairs in DynamoDB.

Update ipcheck function to query DynamoDB to check if the IP exists there rather than the Firehol repository directly.

[johnweland]

• Create a function to write to DynamoDB

  • Function should be scheduled to run ever X hours.
  • Function should compare existing data so as not to duplicate entries.
  • Function should store ip address and ipset file as key:value pairs.

• Create a function to read from DynamoDB

  • Function should take an optional parameter as a query.
  • If no query is passed, return all data.
  • If an query parameter is passed (ip) find only that ip and its ipset.
  • If no match is found return null.