[PORT] [LG] Remove dash in identifier to make sure arithmetic expressions can be parsed correctly

[tomlm]

Port this change from botbuilder-dotnet/master branch:
microsoft/botbuilder-dotnet#3712

fixes: #3695
In this PR, identifier can not contain '-'. Template name should not use 'bfactivity-1123'.
This change will make sure expressions like 'user.a-user.b' can be recognize as an arithmetic opration rather than an identifier.

Changed projects

• AdaptiveExpressions
• Microsoft.Bot.Builder.LanguageGeneration
• AdaptiveExpressions.Tests
• Microsoft.Bot.Builder.Dialogs.Adaptive.Templates.Tests
• Microsoft.Bot.Builder.Dialogs.Adaptive.Tests
• Microsoft.Bot.Builder.LanguageGeneration.Tests
• Microsoft.Bot.Builder.TestBot.Json