Extension not loaded because it uses synchronous autoload mechanism

[Greg-Smulko]

Extension not loaded because it uses synchronous autoload mechanism:

More info:

• https://devblogs.microsoft.com/visualstudio/updates-to-synchronous-autoload-of-extensions-in-visual-studio-2019/
• https://docs.microsoft.com/en-us/visualstudio/extensibility/how-to-use-asyncpackage-to-load-vspackages-in-the-background?view=vs-2019

VS 2019 (16.2.5).