Add ViewCustomize.context.project.id

[onozaty]

Is your feature request related to a problem? Please describe.

When there is only one project, the project ID selection is not displayed in the Issue edit screen.
Therefore, there is no easy way to get the project ID.

Describe the solution you'd like

Add ViewCustomize.context.project.id.

[onozaty]

It has been released as v3.0.0.