* Limit VADD REDUCE dim to not exceed original dim
Enforce VADD key [REDUCE dim] to reject dim that is bigger than the HNSW original dim, as dimension reduction makes no sense for reduce_dim > original_dim.
This also avoids OOM and possible heap overflow on later allocations using reduce_dim.
This should be backported to Redis version 8.0, 8.2 and 8.4.