Remove usage of URI and ServerId as identifier for Jupyter Servers

[DonJayamanne]

• The term Uri is used in a number of places to point to the address of the Jupyter Server as well as an identifyer for a Jupyter Server.
  • Without inspecting the Uri we have no idea what it is, hence we have if conditions in a number of places
  • Unfortunately there are places where this if condition isn't used and has caused bugs (password storage and connection)
  • Error messages and the like assume the Url is the Jupyter Server Uri, but its not.
  • Basically its just too complex
• The Uri is constructed from the Jupyter Provider Id and Handle, however without the extensionId it is not unique.
  • Its possible to have two extensions with the same provider id, and this can cause issues when we try to connect to them.
• The Uri is constructed from the Jupyter Provider Id and Handle
  • Hence Uri is kind of always unique (provided we include the extension id into the mix)
  • Thus we do not need computeServerId
  • We have serverId used as identifiers in a number of places, along with this Uri as well
  • We have two types of identifiers

Tasks

Beta Give feedback

1. Remove Server Id
2. Remove serverId
3. Replace serverId with the Uri
4. Replace Uri with an object, today its called idAndHandle, its basically a Jupyter Server Identifier (lets call this JupyterServerProviderHandle and will include extensionId as a new property