Refactor: clean up dependencies, JS CDN usage, chart loading

[trieloff]

This refactoring cleans up the code quite a bit:

1. instead of using a smattering of CDNs to load dependencies from, we use only one
2. instead of loading dependendencies sometimes as UMD, somethimes as ESM, only use ESM
3. use ESM Import Maps to specify dependencies per HTML file
4. slicer.js no longer loads all possible charts, the correct chart to use is injected by the HTML

chart.js's adapter system (which we need for date/time and sankey) requires dependencies to be strictly aligned. Both our external dependencies pin chart.js@4.4.0 so I'm upgrading them to 4.4.2 – this is not just for consistency, but to ensure functionality

• refactor(rum-explorer): use esm import maps
• refactor(barchart): use esm importmaps
• refactor(rum-explorer): use esm importmaps for piechart
• refactor(rum-explorer): use esm importmaps for dependencies
• refactor(rum-explorer): remove log statement
• refactor(rum-explorer): remove unneeded dependencies from pie chart
• refactor(rum-explorer): remove unneeded dependencies from bar chart

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Commits

* [35608d2](https://github.com/adobe/helix-website/commit/35608d28f9108c994cc177b0cd8ccefc2240a698) :white_check_mark: (latest) * [76a7d7f](https://github.com/adobe/helix-website/commit/76a7d7fe1b38f828164bda9a7b1c44b2cf66ebc8) :white_check_mark: * [385b9f5](https://github.com/adobe/helix-website/commit/385b9f59f74b6628c1f82a4e1cc218c650e65cd7) :white_check_mark: * [a43139e](https://github.com/adobe/helix-website/commit/a43139e7efd72940dd669a6759f44d3e674ec2d8) :white_check_mark: * [db8650e](https://github.com/adobe/helix-website/commit/db8650e71a9feed1f4bf4e8efea1a7249b66bfd7) :white_check_mark: * [b1f3dae](https://github.com/adobe/helix-website/commit/b1f3dae91397a07a0a98165f4fee56ac5493daa1) :white_check_mark: * [93f0b16](https://github.com/adobe/helix-website/commit/93f0b167d6c063c5da42dcbd6f964887874f96a6) :white_check_mark: * [a6a34b0](https://github.com/adobe/helix-website/commit/a6a34b0864ce35bc802bf5a0a8fa45f450fcbe24) :white_check_mark: * [5a805bf](https://github.com/adobe/helix-website/commit/5a805bfc01faf7f191b1caf2f2b5cd98de696c5b) :white_check_mark: * [1d26598](https://github.com/adobe/helix-website/commit/1d2659844a5291c2bdbbc010032cf26d1bdf6055) :white_check_mark: