Apply Expression equal function in LG library

[Danieladu]

Fixes #5508

Description

Firstly, let me explain the cause of the bug:

        {
          "$kind": "Microsoft.SetProperty",
          "property": "$answer",
          "value": {
            "score": 1
          }
        },

Here is a SetProperty action, and in the LG template, the customer uses :
${$answer.score} to achieve the score.

Actually, In dialog memory manager, if the value is a JObject, it would use jobj.TryGetValue to get the result.

botbuilder-dotnet/libraries/Microsoft.Bot.Builder.Dialogs/ObjectPath.cs

Line 647 in fc5fb14

jobj.TryGetValue(property, StringComparison.InvariantCultureIgnoreCase, out var value);

And, the result would be a long int(Int64) format data but not a Int32 format data. So, the result is actually 1L, but not 1

Another side, In the comparison of switch expression and case expression, the LG SDK treat they are different.
Original code:

botbuilder-dotnet/libraries/Microsoft.Bot.Builder.LanguageGeneration/Evaluator.cs

Line 284 in fc5fb14

if (switchExprResult == caseExprResult || (switchExprResult != null && switchExprResult.Equals(caseExprResult)))

Specific Changes

Unify the comparison mechanism of LG and expression. Apply the equal function of Expression in LG library.