I've been working on more/better configuration for improving DEBUGINFOD
support. This is the first (and easiest) slice of the work.
I've added `timeout` and `cache-path` settings that can override the
DEBUGINFOD library defaults (and environment variables.) I also renamed
the `plugin.symbol-locator.debuginfod.server_urls` setting to
`server-urls` to be more consistent with the rest of LLDB's settings
(the underscore switch is switched to a hyphen)
I've got a few tests that validate the cache-path setting (as a
side-effect), but they've exposed a few bugs that I'll be putting up a
separate PR for (which will include the tests).
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Co-authored-by: Kevin Frei <freik@meta.com>
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