fix: significantly reduce client bundle size

[rchl]

The import * as Sentry from '~@sentry/vue' has prevented tree shaking from working.

This results in about 221KB reduction when using tracing and a bit less when not using tracing (that's weird, yes, but looks like related to Sentry SDK itself).

Unfortunately it doesn't benefit when using lazy loading. Maybe there is a way to handle it using webpack's magic comments in

sentry-module/src/templates/plugin.lazy.js

Line 112 in 994f333

const Sentry = await import(/* <%= magicComments.join(', ') %> */ '~@sentry/vue')

but I haven't investigated at that point.

EDIT: There is a webpack magic comment webpackExports but it's only available from webpack 5.