Incorrect PO total estimated cost in some cases

Overview
The calculation of the order total estimated price is done in MODORDERS-181. However implementation is just to sum double values. This is not right (for example, 1.23 + 4.56 = 5.789999999999999 see Why You Should Never Use Float and Double for Monetary Calculations)

Steps to reproduce

• Create order:

  HOST=folio-testing-backend01.aws.indexdata.com
  curl -X POST \
    http://$HOST:9130/orders/composite-orders \
    -H 'Content-Type: application/json' \
    -H 'x-okapi-token: $OKAPITOKEN' \
    -d '{
    "orderType": "One-Time",
    "vendor": "e0fb5df2-cdf1-11e8-a8d5-f2801f1b9fd1",
    "compositePoLines": [
      {
        "acquisitionMethod": "Purchase At Vendor System",
        "cost": {
          "listUnitPrice": 1.23,
          "currency": "USD",
          "quantityPhysical": 1
        },
        "locations": [
          {
            "locationId": "758258bc-ecc1-41b8-abca-f7b610822ffd",
            "quantityPhysical": 1
          }
        ],
        "orderFormat": "Physical Resource",
        "source": {
          "code": "FOLIO"
        }
      },
      {
        "acquisitionMethod": "Purchase At Vendor System",
        "cost": {
          "listUnitPrice": 4.56,
          "currency": "USD",
          "quantityPhysical": 1
        },
        "locations": [
          {
            "locationId": "f34d27c6-a8eb-461b-acd6-5dea81771e70",
            "quantityPhysical": 1
          }
        ],
        "orderFormat": "Physical Resource",
        "source": {
          "code": "FOLIO"
        }
      }
    ]
  }'

• The created order:

  {
    "id" : "a8b53a33-bd91-4d35-99c0-37cb7a0ca8c2",
    "notes" : [ ],
    "poNumber" : "10003",
    "orderType" : "One-Time",
    "totalEstimatedPrice" : 5.789999999999998,
    "totalItems" : 2,
    "vendor" : "e0fb5df2-cdf1-11e8-a8d5-f2801f1b9fd1",
    "workflowStatus" : "Pending",
    "compositePoLines" : [ {
      "id" : "d98fef88-fdee-4f4f-8777-580d943dc4e7",
      "acquisitionMethod" : "Purchase At Vendor System",
      "alerts" : [ ],
      "claims" : [ ],
      "contributors" : [ ],
      "cost" : {
        "listUnitPrice" : 1.23,
        "currency" : "USD",
        "discountType" : "percentage",
        "quantityPhysical" : 1,
        "poLineEstimatedPrice" : 1.23
      },
      "fundDistribution" : [ ],
      "locations" : [ {
        "locationId" : "758258bc-ecc1-41b8-abca-f7b610822ffd",
        "quantityPhysical" : 1
      } ],
      "orderFormat" : "Physical Resource",
      "poLineNumber" : "10003-1",
      "purchaseOrderId" : "a8b53a33-bd91-4d35-99c0-37cb7a0ca8c2",
      "receiptStatus" : "Pending",
      "reportingCodes" : [ ],
      "source" : {
        "code" : "FOLIO"
      },
      "tags" : [ ]
    }, {
      "id" : "62980fc8-d37e-4926-b90f-acda9855283f",
      "acquisitionMethod" : "Purchase At Vendor System",
      "alerts" : [ ],
      "claims" : [ ],
      "contributors" : [ ],
      "cost" : {
        "listUnitPrice" : 4.56,
        "currency" : "USD",
        "discountType" : "percentage",
        "quantityPhysical" : 1,
        "poLineEstimatedPrice" : 4.56
      },
      "fundDistribution" : [ ],
      "locations" : [ {
        "locationId" : "f34d27c6-a8eb-461b-acd6-5dea81771e70",
        "quantityPhysical" : 1
      } ],
      "orderFormat" : "Physical Resource",
      "poLineNumber" : "10003-2",
      "purchaseOrderId" : "a8b53a33-bd91-4d35-99c0-37cb7a0ca8c2",
      "receiptStatus" : "Pending",
      "reportingCodes" : [ ],
      "source" : {
        "code" : "FOLIO"
      },
      "tags" : [ ]
    } ],
    "metadata" : {
      "createdDate" : "2019-03-27T09:01:05.100+0000",
      "createdByUserId" : "a867202f-4045-576c-8152-cb02220c6393",
      "updatedDate" : "2019-03-27T09:01:05.100+0000",
      "updatedByUserId" : "a867202f-4045-576c-8152-cb02220c6393"
    }
  }
  

Actual Results: As can be seen "totalEstimatedPrice" is 5.789999999999998 instead of expected 5.79

Expected: use BigDecimal instead of double when operating with prices