Raw-rs: Refactor to run multiple steps in a single loop (#1972)

* Prevent extra allocation in convert to RGB step

* Run preprocessing steps in a single loop

* Create new API to call steps in pipeline

* Include transform and gamma correction step

* cargo fmt

* Split scale colors into two steps

* Code relocations

* cargo fmt

* Implement transform traits for all tuples

* Replace Captures trick with the new `use` keyword

libraries/raw-rs/src/postprocessing/mod.rs

@@ -1,3 +1,4 @@
 pub mod convert_to_rgb;
 pub mod gamma_correction;
+pub mod record_histogram;
 pub mod transform;