Update apollo.config.json with npm postinstall

[LongLiveCHIEF]

Description

The rover npm package's postinstall script for npm could detect the presence of a apollo.config.json file in the package rover is being installed to, and either:

• report into terminal that apollo.config.json was found, and if desired the bin path for the rover config should be updated to node_modules/@apollo/rover/binary/rover-<version>
• prompt the user interactively if they'd like to update the apollo.config.json:rover.bin
• just automatically overwrite the apollo.config.json:rover.bin

There is a possibility here that the rover config file proposal (#2047 ) could have a setting to define the desired behavior at a project level with a syncApolloConfig: true option.

Without this feature, users who don't install rover globally, but prefer to manage it as a npm package dependency can have a difficult time getting the path of the rover binary. (They don't all know to look in node_modules/@apollo/rover/bin)

An alternative to this feature would be for the vscode ide extension to look in the node_modules/@apollo/rover/bin folder automatically in addition to looking for the rover binary on the users PATH.