Introduce Issuer handling in the Authentication stack (#248948)

Mostly plumbing... this enables:
```
vscode.authentication.getSession('microsoft', scopes, { issuer: "https://login.microsoftonline.com/common/v2.0" });
```
And the respective API for an auth providers to handle it being passed in.

This props up work in MCP land which needs a way to map an issuer to an auth provider... but I certainly see utility outside of that space.

Fixes https://github.com/microsoft/vscode/issues/248775#issuecomment-2876711396

extensions/microsoft-authentication/package.json

@@ -15,7 +15,8 @@
   "activationEvents": [],
   "enabledApiProposals": [
     "idToken",
-    "nativeWindowHandle"
+    "nativeWindowHandle",
+    "authIssuers"
   ],
   "capabilities": {
     "virtualWorkspaces": true,
@@ -31,7 +32,10 @@
     "authentication": [
       {
         "label": "Microsoft",
-        "id": "microsoft"
+        "id": "microsoft",
+        "issuerGlobs": [
+          "https://login.microsoftonline.com/*/v2.0"
+        ]
       },
       {
         "label": "Microsoft Sovereign Cloud",