VolumeManager/Volume: Fix issue with compute shaders

[skalarproduktraum]

@aryaman-gupta had reported an issue where compute shaders would not be used if the VolumeManager is recreated. This PR fixes that, and introduces a new customTextures list in VolumeManager, where the developer can specify custom textures that are not under the VolumeManager's responsibility.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #386 (33043b4) into master (35e174c) will increase coverage by 0.15%.
The diff coverage is 61.90%.

@@             Coverage Diff              @@
##             master     #386      +/-   ##
============================================
+ Coverage     55.61%   55.76%   +0.15%     
- Complexity     1975     1988      +13     
============================================
  Files           169      169              
  Lines         19350    19356       +6     
  Branches       2986     2993       +7     
============================================
+ Hits          10760    10792      +32     
+ Misses         7452     7433      -19     
+ Partials       1138     1131       -7     

Flag	Coverage Δ	Complexity Δ
integrationtests	55.72% <61.90%> (+0.14%)	0.00 <0.00> (ø)
unittests	22.80% <0.00%> (+<0.01%)	0.00 <0.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...n/kotlin/graphics/scenery/volumes/VolumeManager.kt	81.07% <53.33%> (+1.68%)	60.00 <0.00> (+6.00)
src/main/kotlin/graphics/scenery/volumes/Volume.kt	56.36% <83.33%> (+0.44%)	15.00 <0.00> (ø)
...graphics/scenery/backends/vulkan/VulkanRenderer.kt	66.74% <0.00%> (+0.31%)	84.00% <0.00%> (ø%)
...phics/scenery/backends/vulkan/VulkanObjectState.kt	89.06% <0.00%> (+0.78%)	28.00% <0.00%> (+1.00%)
.../kotlin/graphics/scenery/volumes/SceneryContext.kt	64.77% <0.00%> (+1.14%)	41.00% <0.00%> (+1.00%)
...in/graphics/scenery/volumes/VolumeShaderFactory.kt	69.85% <0.00%> (+1.47%)	28.00% <0.00%> (+4.00%)
...raphics/scenery/backends/vulkan/VulkanScenePass.kt	80.00% <0.00%> (+2.09%)	21.00% <0.00%> (ø%)
...hics/scenery/utils/TimestampedConcurrentHashMap.kt	35.29% <0.00%> (+17.65%)	5.00% <0.00%> (+1.00%)

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[skalarproduktraum]

How is this looking @aryaman-gupta, can we merge this?

[aryaman-gupta]

Yes @skalarproduktraum, looks good! It worked well with my insitu code 👍