fix(bloom): crash due to pinnable slice in bloom filter

[mapleFU]

rocksdb::PinnableSlice has a pinned_ flag:

1. If pinned_, GetSelf returns nullptr.
2. Else, GetSelf returns pointer to self

Most case it's (2), but when we meet case (1), the code below fails:

*bf_data_list.back().GetSelf() = std::move(data);
bf_data_list.back().PinSelf();

This patch fixes that

It closes #2834.

[mapleFU]

@hll1213181368

[mapleFU]

@git-hulk @PragmaTwice Would you mind take a look? Test is added

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
60.8% Coverage on New Code
1.2% Duplication on New Code

See analysis details on SonarQube Cloud