Raw-rs: add post-processing steps (#1923)

* add convert_to_rgb step

* add code to generate gamma correction curve

* add gamma correction step

* fix clippy warnings and cargo fmt

* remove unnecessary dependencies

* Code review 1

* Code review 2

* fix the order of operations

* Code review 3

---------

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

Cargo.lock

@@ -743,12 +743,6 @@ version = "3.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "79296716171880943b8470b5f8d03aa55eb2e645a4874bdbb28adb49162e012c"
 
-[[package]]
-name = "by_address"
-version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64fa3c856b712db6612c019f14756e64e4bcea13337a6b33b696333a9eaa2d06"
-
 [[package]]
 name = "bytemuck"
 version = "1.16.1"
@@ -1695,12 +1689,6 @@ dependencies = [
  "pin-project-lite",
 ]
 
-[[package]]
-name = "fast-srgb8"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd2e7510819d6fbf51a5545c8f922716ecfb14df168a3242f7d33e0239efe6a1"
-
 [[package]]
 name = "fastnoise-lite"
 version = "1.1.1"
@@ -4351,30 +4339,6 @@ dependencies = [
  "ttf-parser 0.24.0",
 ]
 
-[[package]]
-name = "palette"
-version = "0.7.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4cbf71184cc5ecc2e4e1baccdb21026c20e5fc3dcf63028a086131b3ab00b6e6"
-dependencies = [
- "approx",
- "fast-srgb8",
- "palette_derive",
- "phf 0.11.2",
-]
-
-[[package]]
-name = "palette_derive"
-version = "0.7.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f5030daf005bface118c096f510ffb781fc28f9ab6a32ab224d8631be6851d30"
-dependencies = [
- "by_address",
- "proc-macro2",
- "quote",
- "syn 2.0.72",
-]
-
 [[package]]
 name = "pango"
 version = "0.15.10"
@@ -5003,7 +4967,6 @@ dependencies = [
  "image 0.25.2",
  "libraw-rs",
  "num_enum 0.7.2",
- "palette",
  "reqwest 0.12.5",
  "tag-derive",
  "thiserror",