Add empty [workspace] to Cargo.toml.

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This works around rust-lang/cargo#6745 and allows cubeb-pulse-rs to appear as a subdirectory of a workspace member in another project (for instance, cubeb-rs).

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cc @padenot - any chance of taking a look at this? thanks!

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cc @kinetiknz on this one as well

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Looks like this may have cause clippy to start running on things it wasn't running on before(?)

[kinetiknz]

Yeah, clippy is now including pulse-rs and pulse-ffi. Quick fix is to exclude those crates from the workspace (which would be equivalent to the behaviour before [workspace] was added), but it'd be better to fix the clippy errors. Similar issue showing up in mozilla/cubeb-coreaudio-rs#236 with coreaudio-sys-utils.

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I think there are far too many errors for me to fix them in this PR, in particular as a number of them are due to missing unsafe tags, which may require invasive changes to address. For now, I will exclude these directories from the clippy check in question, and I have filed #95 to be addressed as it fits in.

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On second thought, I think the approach I took with that last commit is not quite right; it might also break anyone running cargo clippy manually or on projects that depend on this crate. Perhaps instead we should fix the 'easy' findings and silence the more involved ones.

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@kinetiknz this is ready for a re-review now :)

( @padenot - if you could please trigger a presubmit run so I can fix any lingering errors I missed locally, I'd appreciate it)

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One of the nightly errors is due to rust-lang/rust-clippy#13531. I can fix the others.

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And this should be ready for a re-run now, too

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reformatted

[kinetiknz]

Thank you!

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Thanks!