feat: Add endpoints to retrieve summary of team/agents over a period of time (#8916)

- Internal APIs to prototype reporting improvements.

app/controllers/api/v2/accounts/summary_reports_controller.rb

@@ -0,0 +1,36 @@
+class Api::V2::Accounts::SummaryReportsController < Api::V1::Accounts::BaseController
+  before_action :check_authorization
+  before_action :prepare_builder_params, only: [:agent, :team]
+
+  def agent
+    render_report_with(V2::Reports::AgentSummaryBuilder)
+  end
+
+  def team
+    render_report_with(V2::Reports::TeamSummaryBuilder)
+  end
+
+  private
+
+  def check_authorization
+    authorize :report, :view?
+  end
+
+  def prepare_builder_params
+    @builder_params = {
+      since: permitted_params[:since],
+      until: permitted_params[:until],
+      business_hours: ActiveModel::Type::Boolean.new.cast(permitted_params[:business_hours])
+    }
+  end
+
+  def render_report_with(builder_class)
+    builder = builder_class.new(account: Current.account, params: @builder_params)
+    data = builder.build
+    render json: data
+  end
+
+  def permitted_params
+    params.permit(:since, :until, :business_hours)
+  end
+end