Remove last possible std::collections and alloc uses #635
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Follow up on #632
This removes remaining std::collections usages and
slab
.Some internal uses remain for interoperability with crates such as
codespan_reporting
andtoml
(for workspaces). These uses should eventually be reviewed to ensure that it's made clear that they should not be exposed to untrusted inputs.More documentation has also been added, including a new book page on sandboxing.