New Node.js module resolution system reads `package.json` from imported
modules by reading from the file natively in C++ without calling into
`fs.readFileSync`. The ASAR FS wrapper code had copied files out into a
temporary folder as a workaround, but it is inefficient and does not
cover all module resolution mechanisms in Node.js.
In this change we expose `overrideReadFileSync` method on the `modules`
binding in Node.js, and use this override to call into ASAR-supporting
`fs.readFileSync`.
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