Update #[min/max] node macro attributes to #[soft/hard]_[min/max] and make them clamp their input data (#2464)

* Fix min and max macro not enforcing limits when data flows

* Use trait based clamping

* Remove min/max from testing

* cargo fmt

* Resolve into min, and hard_min

* cargo fmt

* fix traits

* cargo fmt

* fix tests

* rename as soft_x

* Add validation code

* Clean up (not compiling because of DVec2 clamping)

* Avoid needing to add trait bounds to node definitions

* Code review

---------

Co-authored-by: Dennis Kobert <dennis@kobert.dev>
Co-authored-by: Keavon Chambers <keavon@keavon.com>

node-graph/gcore/src/raster/adjustments.rs

@@ -1399,7 +1399,7 @@ async fn posterize<T: Adjust<Color>>(
 	)]
 	mut input: T,
 	#[default(4)]
-	#[min(2.)]
+	#[hard_min(2.)]
 	levels: u32,
 ) -> T {
 	input.adjust(|color| {
@@ -1435,6 +1435,7 @@ async fn exposure<T: Adjust<Color>>(
 	offset: f64,
 	#[default(1.)]
 	#[range((0.01, 10.))]
+	#[hard_min(0.0001)]
 	gamma_correction: f64,
 ) -> T {
 	input.adjust(|color| {