Support no_std in the wasmtime crate
#8342
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This commit refactors the `wasmtime-runtime` crate to avoid the `std::panic` module entirely if it's compiled with `panic=abort`. From an optimization perspective this is not really required since it'll optimize the same either way with `-Cpanic=abort`, but avoiding `std::panic` can help make the code a bit more portable. This refactoring bundles in the `catch_unwind` with the longjmp of the panic to keep the `#[cfg]` in one location. Callers are then updated as appropriate.
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This is a proof-of-concept implementation in support of #8341. I do not plan on landing this as-is, but instead wanted to open a draft for comments and such. This is missing pieces such as CI integration, for example.