Ability to run post-install anonymous scripts on unlocked packages

[wspringe]

Is your feature request related to a problem? Please describe.
Currently, we are only able to run post-install anonymous scripts for 2GP managed packages.

What are you trying to do
Execute anonymous scripts after the install of an unlocked package, so we can automate some action like record creation after the package is installed. We want the setup and record creation for an unlocked package to be fully automated from an SFDX command so that we can avoid missing manual steps after an unlocked package installation.

Describe the solution you'd like
Ability to specify one or multiple anonymous scripts in the sfdx-project.json file of an SFDX project that is an unlocked package, and the script(s) will execute after the unlocked package is installed into a Salesforce org.

Describe alternatives you've considered
SFDX plugin, internal wrapper CLI solution, manually executing scripts after package installation

Additional context
Add any other context or screenshots about the feature request here.

[github-actions]

Thank you for filing this feature request. We appreciate your feedback and will review the feature at our next grooming or sprint planning session. We prioritize feature requests with more upvotes and comments.

[uip-robot-zz]

This issue has been linked to a new work item: W-10346855

[yippie]

Yes pease, this would be super helpful

[kyle-chiu]

This is a great idea!

[Slgrande]

We really need this!

[madhankumargi]

Much needed for automating CICD process

[pravirpal]

much needed, awaiting this feature.