Added biharmonic example in libceed#1803

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aneeshs1729 wants to merge 4 commits intoCEED:mainfrom

aneeshs1729:addedBiharmonicExampleInLibCeed

Commits on Apr 18, 2025

Create biharmonic.cpp
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Commits on Apr 19, 2025

Update biharmonic.cpp
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Commits on May 2, 2025

added the .h and .hpp files for biharmonic
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Commits on May 22, 2025

edited biharmonic.cpp to be in the style of the other boundary problems
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