Add morphology operations (ErodeBorder/DilateBorder)

[johnnynunez]

Summary

Adds NPP morphology entry points to FastNPP: ErodeBorder and DilateBorder over an arbitrary binary structuring element (mask + size + anchor), for 8u (C1/C3), 16u (C1) and 32f (C1).

Each entry point takes the source image and the structuring element and returns a complete fused read operation (the neighbourhood min/max runs in a single kernel). The REPLICATE border matches nppiErodeBorder / nppiDilateBorder with NPP_BORDER_REPLICATE.

A CUDA::nppim link dependency was added to the test discovery so morphology tests resolve the NPP morphology symbols.

Dependency

Builds on the new fk::Morphology (Erode/Dilate) functor in Libraries-Openly-Fused/FusedKernelLibrary#275. Merge that PR and update the fkl submodule first.

Tests

tests/morphology/fastNPP_morphology_test.cu cross-checks against nppiErodeBorder / nppiDilateBorder with NPP_BORDER_REPLICATE (shared aligned pitch):

[PASS] ErodeBorder_8u_C1R  3x3 anchor(1,1)   0 mismatches
[PASS] DilateBorder_8u_C1R 3x3 anchor(1,1)   0 mismatches
[PASS] ErodeBorder_8u_C1R  5x3 anchor(2,1)   0 mismatches
[PASS] DilateBorder_8u_C1R 5x5 anchor(2,2)   0 mismatches
ALL PASS

Bit-exact vs NPP, including non-rectangular structuring elements and off-centre anchors. Integrates with CTest.

Environment

CUDA 13.3 / GCC 11.5, sm_120.

[johnnynunez]

Rebased onto current main, but this PR (morphology (ErodeBorder/DilateBorder)) is BLOCKED: it #includes image_processing/morphology.h, which is not yet merged into FKL main — it lives in FKL #275 (feat/morphology-ops).

Verified on RTX PRO 6000 / CUDA 13.3: it does not compile against any merged fkl (4642ba1, a63c000, or 7f25849) because those headers don't exist there yet.

Action: merge the corresponding FKL PR first, then bump the fkl submodule (a follow-up to #22) so these headers are available; this FastNPP PR will then build + pass. I rebased it locally but did not push the rebase to keep CI from going red on an unbuildable branch.

[morousg]

You need to update the fkl submodule, in order to get the fkl::Morphology features