[Feature] Install dependencies without optional

[RuBAN-GT]

• I'd be willing to implement this feature (contributing guide)
• This feature is important to have in this repository; a contrib plugin wouldn't do

Describe the user story

Hi everyone, in my package.json I have several entries from optionalDependencies.
The previous yarn v1 has an ability to ignore them using ignore-optional flags.
What about the latest yarn v2? As I understood properly install command doesn't provide the way to control it (https://yarnpkg.com/cli/install).

Describe the solution you'd like

To add ignore-optional option for install command.

Thank you!