portfolio page: implement positions table

[TalDerei]

follow-up work from #220

• open positions
• closed positions
• history

importantly, need to add support for pagination or scrolling to handle large numbers of open positions gracefully

Figma reference: https://www.figma.com/design/xWsVprkEgEihweVN9isrGQ/DEX-(Incl.-UI-Lib)?node-id=3658-145100&p=f&t=5zoqHAAlNcIDzQhM-0

[JasonMHasperhoven]

For pagination, we could use: https://github.com/bvaughn/react-virtualized

Let me know, if there are other ideas