[REFACTOR] Fetch BPMN diagrams in projects instead of bundling them with the JS code

[tbouffard]

Currently. the BPMN diagrams are stored as string within the JS bundles. This increases the size of the bundle and does not reflect what an application generally does: it doesn't store the diagrams that are retrieved from services or API.
This also applies to the upcoming "Vue" example: #501

See also #18 (comment)

⚠️ Warning: remember that the "projects" are often deployed in non root context. This can impact the way diagrams are fetched. See https://github.com/process-analytics/bpmn-visualization-examples/pull/501/files/c764eb211ac34014b1091874635ae22b73c84741#diff-538d08d2ccf3dd8a78b49e615961ebd25870ba4e727a2848fd645d8a80f0cd66

Notes

We also have the same need for demo built in other repositories

• [REFACTOR] Demo - fetch BPMN diagrams in projects instead of bundling them with the JS code bpmn-visualization-addons#72
• [REFACTOR] Fetch BPMN diagrams in projects instead of bundling them with the JS code bpmn-visualization-demo-template#20
• [REFACTOR] Fetch BPMN diagrams in projects instead of bundling them with the JS code bonita-day-demo-2023#110
• https://process-analytics.github.io/icpm-demo-2022/

Projects to update

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1. angular
2. lit-element
3. parcel
4. rsbuild: feat: add a TypeScript project built by Rsbuild #601
5. rollup
6. vitejs
7. vue
8. webpack