fix: crash in ANY graph INSERT with property strings >12 chars#630
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When binding inserts against ANY graph tables (_nodes/_edges), the code
constructs a temporary ValueVector without passing a MemoryManager
(defaults to nullptr). For short strings (≤ SHORT_STR_LENGTH=12), the
string_t fits inline and the null MemoryManager is never reached. But
for longer strings — e.g. `{"local":true}` (14 chars) — the overflow
allocation path is taken, dereferencing the null pointer and causing
EXC_BAD_ACCESS in MemoryManager::mallocBuffer.
Fix: pass MemoryManager::Get(*clientContext) when constructing the
temp ValueVector in both bindInsertNode and bindInsertRel.
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Fixes: #628