feat: export 'IS_' and 'CAN_*' environment constants from @lexical/utils

[etrepum]

Exports all of the `IS_*` and `CAN_*` environment constants from @lexical/utils.

export {CAN_USE_DOM} from 'shared/canUseDOM';
export {
  CAN_USE_BEFORE_INPUT,
  IS_ANDROID,
  IS_ANDROID_CHROME,
  IS_APPLE,
  IS_APPLE_WEBKIT,
  IS_CHROME,
  IS_FIREFOX,
  IS_IOS,
  IS_SAFARI,
} from 'shared/environment';

While browser detection isn't really the purview of Lexical, these constants (or copy-pasted equivalents) are often necessary when implementing lower level features or just working around browser quirks. I found them useful to copy when I was working on a project that blended the code from lexical/plain-text and lexical/rich-text, which I found easier to understand and maintain by creating an independent "registerCustomText" rather than picking one and overriding functionality with higher command priorities.

Resolves #5827

[vercel]

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