cloud-sql-proxy

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This PR adds:

• CLI flags for fuse and fuse-temp-dir
• A check if the OS supports FUSE
• a FUSE server that serves a README
• Support for closing the FUSE server

The next PR(s) will include:

• returning a symlink to a Unix domain socket that is connected to the Cloud SQL instance
• (maybe) support for "warming up" instance connection names in FUSE mode

We're going to have to skip macOS builds given the restrictions with adding kernal extensions and install fuse on the ubuntu image. I'll work on that next.

This has some problems and isn't ready for review after all.