[RUBY] Store the AWS SDK return value in DynamoDB

require 'aws-sdk'
sts = Aws::STS::Client.new
ddb = Aws::DynamoDB::Client.new
  table_name: "anytable",
  item: sts.get_caller_identity.to_h.transform_keys(&:to_s).transform_values(&:to_s)

Since the return value of AWS SDK is (almost all?) Struct type, it cannot be stored in the table as it is. It can be stored by hashing and then stringifying the key and value of the hash.

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