Mark old crate names for renamed crates as deprecated

[nategraf]

We have three crates that have been renamed, but their old names are still published on crates.io without any notes.

• bonsai-ethereum-relay
• bonsai-ethereum-contracts
• risc0-ethereum-view-call

We should mark these as deprecated in some way.

[flaub]

There's a bunch of old risc0 crates too, not sure what the best approach is

[nategraf]

One idea would be to publish a new version to each that includes a compile-time warning about the deprecation. We could additionally update the top-level crate docs to include a similar warning.