feat(vectordb): integrate KRL for ARM Kunpeng vector search optimization

[Mijamind719]

• Add third_party/krl: Kunpeng Retrieval Library (KRL) source with ARM NEON/SIMD-optimized L2 and inner-product distance routines
• vector_base.h: add ARM platform macros OV_PLATFORM_ARM, OV_SIMD_NEON, OV_SIMD_SVE
• space_l2.h: on ARM use krl_L2sqr in l2_sqr_neon instead of scalar path
• space_ip.h: on ARM use krl_ipdis in inner_product_neon instead of scalar path
• CMakeLists.txt: enable OV_PLATFORM_ARM on aarch64, build and link KRL static library

On ARM, vectordb uses KRL-optimized paths; on x86 the existing AVX/SSE implementations are unchanged.

Description

Related Issue

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

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Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
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  • macOS
  • Windows

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• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

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