Raw-rs: Add preprocessing and demosaicing steps (#1796)

* add subtract black step

* add scale colors step

* add raw to image step

* implement linear demosiacing and fix errors in previous code

* fix missing variable

* make dependencies of tests optional

* fix error in raw-rs tests

* fix typo in "demosiacing"

* use camera data from ADC and remove downloader

* cargo fmt

* use file_stem instead of file_name

* remove old camera data

* use equality instead of subtring to find model

* store camera_to_xyz in decimal form

* Code review

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

libraries/raw-rs/build-camera-data/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "build-camera-data"
+version = "0.0.1"
+publish = false
+edition = "2021"
+authors = ["Graphite Authors <contact@graphite.rs>"]
+description = "Procedural macro to build the camera data into rust code"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/GraphiteEditor/Graphite/tree/master/libraries/raw-rs/build-camera-data"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+# Workspace dependencies
+quote = { workspace = true }
+syn = { workspace = true }
+proc-macro2 = { workspace = true }
+
+# Required dependencies
+toml = "0.8.15"