Setup a new v8-poc package

This is a new package that depends on rusty-v8 for embedding a v8
engine.  This builds and works on non-musl platforms now because
rusty-v8 provides versions for that.  But we mocked out the loading of
a musl built library.

TODO: iterate on providing the musl built version for musl-linux builds.
TODO: create a release workflow for publishing the artifact that rusty-v8 can link against

codex-rs/v8-poc/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "codex-v8-poc"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[lib]
+name = "codex_v8_poc"
+path = "src/lib.rs"
+
+[features]
+default = []
+rusty_v8 = ["dep:v8"]
+
+[lints]
+workspace = true
+
+[dependencies]
+v8 = { workspace = true, optional = true }
+
+[dev-dependencies]
+pretty_assertions = { workspace = true }