Add stack filter in Awesome Scala (and search)

[adpi2]

Motivation

Idea from @Daenyth in #943

I'd find it really helpful if the new "awesome" list could filter for stack. A really common use case is "I want to find a library for X in the lightbend|typelevel|zio|haoyiverse ecosystem", in order to minimize friction between different stack integrations.

Identified Obstacle

Define and moderate the list of stacks: what makes a project a stack?
For each stack define the list of seed projects.

As a starting point we can have:

• Typelevel cats
• zio
• Akka
• Spark
• com-lihaoyi

Implementation Guideline

1. Add the projectDependencies field in ProjectDocument
2. Fill this field in the SearchSynchrnizer using the database
3. Add a stack parameter in the AwesomePages
4. Define for each Stack the list of seed projects.
5. Use the list of projects of the stack parameter to filter projects in the Elasticsearch query

Expectations

1. The new stack parameter should be tested in ElasticsearchEngineTests
2. The list of stacks should appear as a filter in the awesome Scala pages.