feat: ignore camelcase rule for __webpack variables

[kesselb]

// eslint-disable-next-line camelcase
__webpack_nonce__ = 'foobar'
// eslint-disable-next-line camelcase
__webpack_public_path__ = 'foobar'

Motivation: __webpack_nonce__ will always violate the camelcase rule.

The error is usually ignored with // eslint-disable-next-line camelcase.
It sounds reasonable to me to add the ignore rule by default.

An alternative approach could be to define __webpack_nonce__ as globals. The advantage is that also the un-def violation is gone and globals are by default excluded from the camelcase rule. But it's weird to define __webpack_nonce as global for every app using eslint when the variable is only available when bundled with webpack.

[skjnldsv]

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