use subpath exports #304
Description
For the next major (engines >= 14), let's start using https://nodejs.org/api/packages.html#subpath-exports to export various parts of gax (fallback, main module, and gax separately).
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For the next major (engines >= 14), let's start using https://nodejs.org/api/packages.html#subpath-exports to export various parts of gax (fallback, main module, and gax separately).