snapshots: Consolidate path handling.

Add a new type, `Input`, representing a particular Naga input file, with methods to generate related paths - output files with a particular extension, parameter files, and the input file itself. Use this throughout `snapshots.rs` to generate paths. Give `Input` utility methods for reading and writing files.
gfx-rs · Sep 24, 2023 · 8e3bbfa · 8e3bbfa
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diff --git a/tests/out/spv/debug-symbol-simple.spvasm b/tests/out/spv/debug-symbol-simple.spvasm
@@ -8,7 +8,7 @@ OpMemoryModel Logical GLSL450
 OpEntryPoint Vertex %24 "vs_main" %15 %18 %20 %22
 OpEntryPoint Fragment %57 "fs_main" %51 %54 %56
 OpExecutionMode %57 OriginUpperLeft
-%3 = OpString "debug-symbol-simple"
+%3 = OpString "debug-symbol-simple.wgsl"
 OpSource Unknown 0 %3 "struct VertexInput {
     @location(0) position: vec3<f32>,
     @location(1) color: vec3<f32>,

diff --git a/tests/out/spv/debug-symbol-terrain.spvasm b/tests/out/spv/debug-symbol-terrain.spvasm
@@ -14,7 +14,7 @@ OpEntryPoint Fragment %587 "fs_main" %580 %582 %584 %586
 OpExecutionMode %348 LocalSize 64 1 1
 OpExecutionMode %470 OriginUpperLeft
 OpExecutionMode %587 OriginUpperLeft
-%3 = OpString "debug-symbol-terrain"
+%3 = OpString "debug-symbol-terrain.wgsl"
 OpSource Unknown 0 %3 "// Taken from https://github.com/sotrh/learn-wgpu/blob/11820796f5e1dbce42fb1119f04ddeb4b167d2a0/code/intermediate/tutorial13-terrain/src/terrain.wgsl
 // ============================
 // Terrain Generation