Add Findlibaec CMake module for locating libaec

[jhendersonHDF]

Important

Add Findlibaec.cmake to locate libaec for SZIP support, updating CMakeFilters.cmake and CHANGELOG.md.

• CMake Module:
  • Added Findlibaec.cmake to locate libaec for SZIP support.
  • Defines libaec::aec and libaec::sz targets if found.
  • Sets libaec_FOUND, libsz_FOUND, and related include and library variables.
• Integration:
  • Updated CMakeFilters.cmake to use Findlibaec.cmake for SZIP support.
  • Ensures libsz compatibility library is available when using libaec.
• Documentation:
  • Updated CHANGELOG.md to document the addition of Findlibaec.cmake for SZIP support.

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