Parameterized kernel specs

[AnastasiaSliusar]

References

This work is in progress as JEP jupyter/enhancement-proposals#87

Code changes

There are next changes in:

• Notebook extension
• Console extension

User-facing changes

1. When a user clicks on some kernel on Notebook section on Launch panel and that kernel includes custom kernel spec variables that will be used for customization then a user will see the dialog which will suggest to configure the kernel.
2. When a user has run a kernel and then they wants to change on another kernel, then the user can call another dialog window where they can select a kernel and if this kernel includes custom kernel spec variables the user will be suggested to configure that kernel.
3. When a user clicks on some kernel on Console section on Launch panel then the user will see the same dialog with suggestions to configure a kernel.