Lists the identities in an identity pool.
You must use AWS Developer credentials to call this API.
cognitoidentity_list_identities(IdentityPoolId, MaxResults, NextToken,
  HideDisabled)[required] An identity pool ID in the format REGION:GUID.
[required] The maximum number of identities to return.
A pagination token.
An optional boolean parameter that allows you to hide disabled identities. If omitted, the ListIdentities API will include disabled identities in the response.
A list with the following syntax:
list(
  IdentityPoolId = "string",
  Identities = list(
    list(
      IdentityId = "string",
      Logins = list(
        "string"
      ),
      CreationDate = as.POSIXct(
        "2015-01-01"
      ),
      LastModifiedDate = as.POSIXct(
        "2015-01-01"
      )
    )
  ),
  NextToken = "string"
)
svc$list_identities( IdentityPoolId = "string", MaxResults = 123, NextToken = "string", HideDisabled = TRUE|FALSE )