all: instrument library loading

[TristanCrawford]

Potential fix for #1327

TL;DR This instruments the calls to DynLib.open to log exactly what libraries are missing and returns a consistent LibraryNotFound error.

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As for the issue I was running into earlier: The open call in src/sysgpu/vulkan.zig was not catching and returning in the same manner as the other library loads, which is why I was getting that non-descript FileNotFound error.

One caveat is that some libraries that aren't really required will still log an error, but it's definitely better than the ambiguous errors from before imo.

There may be a better name and/or a better place to put the loadLibrary function, so I'm open to shifting some things around if y'all see fit. Cheers!

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[emidoots]

Two small comments, looks good otherwise! Thanks for improving this!