Add explicit validator-cuda crate (#5985)

validator-cuda/.gitignore

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+/target/
+/farf/

validator-cuda/Cargo.toml

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+[package]
+authors = ["Solana Maintainers <maintainers@solana.com>"]
+edition = "2018"
+name = "solana-validator-cuda"
+description = "Blockchain, Rebuilt for Scale"
+version = "0.19.0-pre0"
+repository = "https://github.com/solana-labs/solana"
+license = "Apache-2.0"
+homepage = "https://solana.com/"
+publish = false
+
+[dependencies]
+solana-core = { path = "../core", version = "0.19.0-pre0", features=["cuda"] }
+solana-validator = { path = "../validator", version = "0.19.0-pre0" }

validator-cuda/src/main.rs

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+fn main() {
+    solana_validator::main()
+}