additional cw-metrics

[ammokhov]

Issue #, if available: #297

Description of changes:

Added some extra metrics so to create cw alarms upon.

Metric No. 1

Namespace: under resource type namespace
Metric name: "HandlerException"
Dimensions: Action, HandlerErrorCode, ResourceType 

Metric No. 2 - not added: the reason being is that operation status for uncaught exceptions is always FAILED, so this metrics seems to be redundant; we have enough of the exact same information in other dimensions;

Namespace:  <does not really matter>
Metric name: "HandlerException"
Dimensions: Action, OperationStatus, ResourceType # with OperationStatus in software.amazon.cloudformation.proxy.OperationStatus.values()

Metric No. 3

Namespace:  under resource type namespace
Metric name: "HandlerException"
Dimensions: Action, ResourceType

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[wbingli]

This line can be removed. We actually want to do forEach for all ErrorCode, not match in what cases.

In case of in a Failed cases, this will only emit metric 1 for the one equals to the ErrorCode, but won't emit 0 metric for other metrics.