Initial node implementation (#4)

Reviewed-on: #4
Co-authored-by: Zack <zack@bfpower.io>
Co-committed-by: Zack <zack@bfpower.io>

node/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "physical-node"
+description = "A node hosts peripherals."
+version.workspace = true
+edition.workspace = true
+repository.workspace = true
+readme.workspace = true
+license.workspace = true
+
+[dependencies.physical]
+path = ".."
+[dependencies.embedded-hal]
+workspace = true
+[dependencies.embedded-hal-async]
+workspace = true
+[dependencies.defmt]
+workspace = true
+[dependencies.uom]
+workspace = true
+[dependencies.embassy-sync]
+workspace = true
+optional = true