* Add bindings for SkImageFilters::RuntimeShader

For https://github.com/JetBrains/skiko/issues/519

* More work for SkImageFilters::RuntimeShader

* Add a check that input array sizes match
* Add tests for the new image filters
* Add JS bindings for the added common bindings

* Add test coverage for the new image filters

* Fix name mismatch in the JS bindings

* Fix SkString conversions in JS bindings

* Fix input shader cast

* Fix runtime shader builder finalizer name

* A slightly different way to wrap the input image filter

* A different way to get char* in the binding

* Pass shader name as interop pointer

* Pass shader names as interop pointer

* Complete bindings for SkRuntimeShaderBuilder::uniform

Add bindings for kInt2, kInt3, kInt4, kFloat2, kFloat3, kFloat4, kFloat2x2, kFloat3x3, kFloat4x4

* Small tweaks to Matrix classes

* Add `Matrix22.IDENTITY`
* Align visibility of float array `mat` field to be public across all three matrix classes (2x2, 3x3, 4x4)