Add script for bundle size analysis

[momesana]

Add facilities (this should merely be scripts in package.json) that help up analyse the created bundle via https://github.com/webpack-contrib/webpack-bundle-analyzer. No need to pollute our dependencies with it as it can be just used via pnpm dlx.

DoD

• it should be possible to create a statistics file by issuing pnpm bundle-stats
• it should be possible to launch the analysis tools issuing pnpm show-bundle-analysis.
• both should be achievable by issuing pnpm analyse-bundle