std.Build.RunStep: introduce addOutputFileArg API

This provides file path as a command line argument to the command being
run, and returns a FileSource which can be used as inputs to other APIs
throughout the build system.

Unfortunately, it is implemented by pooping a ton of temporary files
into zig-cache/tmp for the time being. I think one of the very next
improvements to the build system should be moving the compiler's cache
system to the standard library and using it in the build system. I had a
look at the dependencies and it is already pretty untangled.

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