[IMP] purchase: Add purchase order dashboard

Adds a customized table to top of list and kanban views of requests for
quotation (RFQs). This table includes the following values:
- RFQs to Send (PO.state = 'draft')
- RFQs Waiting (PO.state = 'sent' and PO.date_order >= now)
- RFQs Late (PO.state = 'sent' and PO.date_order < now)
- Avg Order Value (specifically only for POs)
- Avg Days to Purchase (PO.date_approved - PO.date_created and PO.state
  in ('purchase', 'done'))
- Purchased Last 7 Days (specifically only for POs)
- RFQs Sent Last 7 Days (hacky calculation looking at chatter for state
  change 'RFQ' => 'RFQ Sent')

This change corresponds to "Requests for Quotations KPI's" subsection of Purchase
KPIs task.

Task: #2198420

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