Add cargo-hakari

Signed-off-by: Marcel Müller <neikos@neikos.email>

hakari/.gitattributes

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+# Avoid putting conflict markers in the generated Cargo.toml file, since their presence breaks
+# Cargo.
+# Also do not check out the file as CRLF on Windows, as that's what hakari needs.
+Cargo.toml merge=binary -crlf

hakari/Cargo.toml

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+# This file is generated by `cargo hakari`.
+# To regenerate, run:
+#     cargo hakari generate
+
+[package]
+name = "hakari"
+version = "0.1.0"
+edition = "2021"
+description = "workspace-hack package, managed by hakari"
+# You can choose to publish this crate: see https://docs.rs/cargo-hakari/latest/cargo_hakari/publishing.
+publish = false
+
+# The parts of the file between the BEGIN HAKARI SECTION and END HAKARI SECTION comments
+# are managed by hakari.
+
+### BEGIN HAKARI SECTION
+
+### END HAKARI SECTION

hakari/build.rs

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+// A build script is required for cargo to consider build dependencies.
+fn main() {}

hakari/src/lib.rs

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+// This is a stub lib.rs.