Liquidity graph view

[hdevalence]

Penumbra’s on-chain routing means liquidity should be thought of as existing on a graph, rather than in individual pairs or pools. To highlight this to users, the main view of the dashboard should be an interactive graph, probably using SigmaJS or similar tooling. The vertices of the graph should be the assets, and the edges should be trading pairs. The graph view should show users an overview of all of the liquidity in the system, allowing them to see which assets have the most volume, deepest liquidity, and which pairs have direct vs indirect connections.

This should eventually be the landing page for the explorer.

• Add basic SigmaJS graph showing just vertices and edges
• Navigation from a node or edge in the graph to a trading pair view. The app should have a default numeraire, set initially to test_usd but configurable so that it can be set to USDC later, so that clicking on a node (asset) goes to the trading pair view for that token against the numeraire.
• Augment graph styling to visualize DEX data (e.g., volume, slippage, etc). This can be done later.