Parity issue with skill_conversation_id_factory

[EricDahlvang]

Describe the bug

There is no concrete implementation of this in javascript or dotnet sdks.

Python:
https://github.com/microsoft/botbuilder-python/blob/master/libraries/botbuilder-core/botbuilder/core/skills/skill_conversation_id_factory.py

dotnet:
https://github.com/microsoft/botbuilder-dotnet/tree/master/libraries/Microsoft.Bot.Builder/Skills

https://github.com/microsoft/botbuilder-js/tree/master/libraries/botbuilder/src/skills

Expected behavior

parity

[bug]

[EricDahlvang]

We should deprecate this class, if we are not going to include it in the other sdks.

[EricDahlvang]

Also, the python sdk does not have an implement of SkillHttpClient, while javascript and dotnet do.