[FSTORE-1008][APPEND] create feature groups with struct feature#307

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davitbzh wants to merge 3 commits intologicalclocks:masterfrom davitbzh:java_engine_create_fg

Commits on Mar 7, 2025

struct fg
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Commits on Mar 10, 2025

create struct fg
davitbzh
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Commits on Mar 11, 2025

struct fv
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