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Description
What
Adds a C API (SessionC.h / SessionC.cpp) around the existing C++ Session / TableSession, for C/FFI callers without exposing C++ types.
Design
Opaque handles (CSession, CTableSession, CTablet, CSessionDataSet, CRowRecord); public symbols prefixed with ts_*.
TsStatus return codes + thread-local last error via ts_get_last_error().
Thin wrappers: convert C args → C++ types, map exceptions to status codes; reuse existing client logic (no duplicate Thrift layer).
Scope
Tree + table model: connect, metadata, inserts (record/tablet), queries, result iteration, deletes—aligned with current Session behavior.
This PR has:
self-reviewed
tests added or updated
Key files
client-cpp/src/main/SessionC.h, SessionC.cpp
client-cpp/src/test/main_c*.cpp, sessionC*IT.cpp