Introduce new experimental DSL for Postgrest Columns

[jan-tennert]

What kind of change does this PR introduce?

Feature.

What is the new behavior?

Introduces a new type-safe DSL for specifying columns when making a postgrest request. Example:

supabase.from("movies").select(Columns {
    //Basic columns
    named("name", "id" withType "text")
    
    //Foreign columns
    foreign("actors") {
        named("name")
    }
    foreign("studios" withAlias "studio") {
        named("name")
    }
    //Or spread within the response
    foreign("studios") {
        spread = true
        named("name" withAlias "studio_name")
    }
    
    //JSON columns (TODO)
})

Translates to

supabase.from("movies").select(Columns.raw("name,id::text,actors(name),studio:studios(name),...studios(studio_name:name)"))

[github-advanced-security]

detekt found more than 20 potential problems in the proposed changes. Check the Files changed tab for more details.