Introduce object pool to improve object allocation

#### Describe the feature

We can introduce object pool to improve object allocation, we might directly use Netty [Recycler](https://netty.io/4.1/api/io/netty/util/Recycler.html).

#### Use cases

In our SQL Client implementations, `CommandBase` and `CommandCodec` are allocated whenever there's a command being scheduled, the simple queries or preparedQueries API callings will allocate a lot of new objects, we can use the Netty object pool to reduce such memory allocations to improve performance. I think all db implementations can be supported and will benefit from this change.