Document webpack change: Disable compile time evaluation of import.meta.url

[webpack-bot]

A pull request by @pavelsavara was merged and maintainers requested a documentation change.

See pull request: webpack/webpack#15246

---

Problem

Current webpack 5 evaluates import.meta.url to file://some/path/to/source of the build machine.

Fixes webpack/webpack#14445

Proposed changes

add new parser setting importMeta - enable/disable import.meta parsing

module.exports = {
  module: {
    parser: {
      javascript : { importMeta: false }
    }
  }
};

Does this PR introduce a breaking change?
No

What needs to be documented once your changes are merged?

New parser.javascript option importMeta - enable/disable import.meta parsing