Add functions to enable similarity search feature of Opensearch#1447

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yoseplee wants to merge 8 commits intoline:mainfrom

yoseplee:add-similar-search-opensearch

Commits on Mar 21, 2025

feat(opensearch): add CreateKnnIndexDto and implement createKnnIndex method for KNN index creation
yoseplee
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feat(opensearch): add GetSimilarDataDto and implement searchSimilarData method for KNN search functionality
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Commits on Mar 24, 2025

feat(opensearch): rename createKnnIndex to createKNNIndex and normalize index name casing
yoseplee
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