Fix tree shake by adding some /* @__PURE__ */ marks

[0x009922]

Description

I've added /* @__PURE__ */ marks in a few places. In particular - in hasPassiveEvents and isIosDevice initialization code. Unless these variables are actually used in the final bundle, their initialization code now can be safely removed.

More about tree shake annotations:

• https://webpack.js.org/guides/tree-shaking/#clarifying-tree-shaking-and-sideeffects
• https://rollupjs.org/guide/en/#danger-zone → treeshake.annotations
• https://esbuild.github.io/api/#pure

Linked issues

Fixes #254