Update Java bindings for HDR support

[javagl]

The PR #1100 added HDR support.

This PR aims at updating the Java bindings accordingly. (EDIT: So it may fix #1144 , eventually...)

What is done until now:

• Added the UASTC_HDR_6X6_INTERMEDIATE supercompression scheme enum value
• Added the RGBA_HALF/ASTC_HDR_4x4_RGBA/ASTC_HDR_6x6_RGBA transcode format enum values
• Added a new KtxBasisCodec class, corresponding to the codec enum, as requested in a review comment
• Added the new fields that have been added to ktxBasisParams (like uastcHDRUltraQuant etc) to the KtxBasisParams class
• (Minor corresponding cleanups)

What remains to be done:

• Wire this to the native side accordingly, e.g. initialize the new fields and fill the native struct
• Add native versions of the
  KTX_API ktx_bool_t KTX_APIENTRY ktxTexture1_IsTranscodable(ktxTexture1* This);
  functions (for KtxTexture1 and KtxTexture2)
• There seem to be further methods: getColorModel, getTransferFunction, isHDR ... ? Not yet looked at the details
• Add tests, if possible

[CLAassistant]

All committers have signed the CLA.

[MarkCallow]

• There seem to be further methods: getColorModel, getTransferFunction, isHDR ... ? Not yet looked at the details

The first two are not specific to HDR. getTransferFunction has been around for a while and even longer, at least in native, with a different name, getOETF or something like that. Please add all of these to the Java binding.

[MarkCallow]

I have just create PR #1150 to add everything to the Python binding. Letting you know as it may be helpful.

[javagl]

I'll have a closer look at the changes and will try add any changes that might be missing here.
(Hopefully, during the weekend or early next week)

[javagl]

Most of the updates that are specific for the added HDR support should be done now.

(I stumbled over the missing ktxTexture2_IsHDR API entry, but that was fixed in a recent PR - I only had to pull this)

I'll add some further tests for the new functionality.

---

One thing that is "unrelated" to the HDR changes: I noticed that the bindings for

KTX_API khr_df_model_e KTX_APIENTRY
ktxTexture2_GetColorModel_e(ktxTexture2* This);

KTX_API khr_df_primaries_e KTX_APIENTRY
ktxTexture2_GetPrimaries_e(ktxTexture2* This);

are missing, including the corresponding enum equivalents. I've seen that they have been added in your Python binding update PR as well, so I assume that they should also be part of the Java bindings.

I'll try to allocate some time to add them (this could be a new PR, but 🤷‍♂️ it probably makes sense to just add them here...).

[MarkCallow]

Looks good. Thanks. Some test coverage using the new tokens would be great, if time allows.

I am waiting for fixes to two other issues. I will hold off on merging this until those arrive to give you a window for adding ktxTexture2_GetColorModel_e and ktxTexture2_GetPrimaries_e to this PR. They should indeed be included in the Java wrapper.