use continuation-local-storage to store session info

[Eskibear]

About implementation of continuation-local-storage, refer to:
nodejs/node-v0.x-archive#5243

Now simply use:

TelemetryWrapper.registerCommand("commandName",
        (args: any[]): void => {
            // TODO
            TelemetryWrapper.currentSession().id;
        }
);

[Eskibear]

@akaroml

[Eskibear]

@ansyral

[akaroml]

Currently, the session and reporter are in one class. They have different concerns and roles so I would suggest that we separate them.

[Eskibear]

@akaroml If I got it right, they're not defined in one class.
Session is defined in Session.ts
TelemetryReporter is defined in package vscode-extension-telemetry.

TelemetryWrapper.ts defines static variables and functions, e.g. a static TelemetryReporter instance, and a static method currentSession() .

[Eskibear]

got that, Session and TelemetryReporter decoupled.