Add some group parameter to convolutions. (#566)

* Add some group parameter to convolutions.

* Avoid some unnecessary groups checks.

* Move the tensor convolution bits.

* Properh handling of groups.

* Bump the crate version.

* And add a changelog.

candle-core/examples/cpu_benchmarks.rs

@@ -40,7 +40,7 @@ impl Benchmark for Conv1d {
     }
 
     fn run_one(d: &Self::PreProcessData) -> Result<Self::RunResult> {
-        d.0.conv1d(&d.1, 0, 1)
+        d.0.conv1d(&d.1, 0, 1, 1)
     }
 
     const ITERS: usize = 5;
@@ -59,7 +59,7 @@ impl Benchmark for Conv2d {
     }
 
     fn run_one(d: &Self::PreProcessData) -> Result<Self::RunResult> {
-        d.0.conv2d(&d.1, 0, 1)
+        d.0.conv2d(&d.1, 0, 1, 1)
     }
 
     const ITERS: usize = 1;