Introduce a new CytoscapeGraph class to manage graph elements and display them in a webview. Enable node selection to show detailed information.

Tasks:

• Merge in missing commits from main
• Fix that 'Run and explain' doesn't open the view, but 'Explain without running does'
• Improve formatting of nodes in webview
• stretch: Determine if coloring each node can be based on the old logic
  https://github.com/codefori/vscode-db2i/blob/main/src/views/results/explain/doveTreeDecorationProvider.ts#L38
• stretch: See about embedding icons onto nodes
  Here are the attached icons for each different node type: https://github.com/codefori/vscode-db2i/blob/main/src/views/results/explain/doveResultsView.ts#L13
  Perhaps you need this to embed the icons into the webview? https://github.com/microsoft/vscode-codicons
• Attach description to each node if applicable
  Old logic here: https://github.com/codefori/vscode-db2i/blob/main/src/views/results/explain/doveResultsView.ts#L126
• Stop using remote URL to pull in cytoscape and embed into the build
• Update icon.ts to include all possible labels