Add config for metadata size, index cache size and index cache page size for bloom filter index

[CookiePieWw]

What type of enhancement is this?

Configuration

What does the enhancement do?

Currently bloom filter index and inverted index uses the same config for metadata size, content size and content page size in cache. We'd better set them separatly since they may be different IO size pattern.

Implementation challenges

No response

[evenyag]

We may need further discussion on how to organize these cache configs. I prefer not exposing to many configs to users.

[CookiePieWw]

We may need further discussion on how to organize these cache configs. I prefer not exposing to many configs to users.

Got you. Currently the docs of the config only mentioned inverted index. Maybe we can update it first.