fixing crashes related to Repeated NestedMessage Parsing and bugs in PackToAny API

[ni-sujain]

fix for ni/measurement-plugin-labview#485, #351

Issue
Given a proto file having repeated NestedMessage

e.g.

syntax = "proto3";

package mytest;

service RouteGuide {
    rpc GetFeature(Name) returns (MyFeatureList) {}
}

message Name {
    string name = 1;
}

message MyFeatureList
{
  repeated Feature feature = 1;    
}

message Feature {
    repeated string res = 1;
}

LV client was crashing. This started happening after #335 where we added some client-side performance improvements. It turns out that while parsing repeated Nested Messages/Strings

• LVMessageEfficient::ParseString()
• LVMessageEfficient::PostInteralParseAction()

DSNewHandle does not work properly can lead to access violations in tdcore.

Fix

• Main fix was to use NumericArrayResize instead of DSNewHandle; this might degrade performance a little bit.
• Fixed a bug with duplicate copies in _repeatedStringValuesMap . Used continueIndex from parent NestedMessage to formulate unique key for _repeatedStringValuesMap
• Fixed the LVRepeatedNestedMessageMessageValue::ByteSizeLong to calculate the tag size based on protobuf index rather passing fixed 1UL.