support large jsonb values

[wangrunji0408]

Risingwave ran into this panic when building a jsonb array.

thread 'risingwave-streaming-actor' panicked at /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/jsonbb-0.1.3/src/entry.rs:69:9:
offset too large
...
  20:     0x562e317889f0 - jsonbb::builder::Builder<W>::add_value::hb52ff40cea7658ec
  21:     0x562e3182cecb - <risingwave_common::array::jsonb_array::JsonbArrayBuilder as risingwave_common::array::ArrayBuilder>::append_n::h11d8feb14fa4e818
                               at /risingwave/src/common/src/array/jsonb_array.rs:57:21
  22:     0x562e32d97ab2 - risingwave_common::array::ArrayBuilderImpl::append_n::h29150fb6718c1242
  23:     0x562e327dc789 - risingwave_common::array::ArrayBuilderImpl::append::h07772f518f08d33c
                               at /risingwave/src/common/src/array/mod.rs:492:9
  24:     0x562e327dc789 - risingwave_stream::common::builder::StreamChunkBuilder::append_iter::h0f99e028cdec90d6
                               at /risingwave/src/stream/src/common/builder.rs:97:37
  25:     0x562e327dc8c3 - risingwave_stream::common::builder::StreamChunkBuilder::append_row::hbfb0e0cd55d60cd3
                               at /risingwave/src/stream/src/common/builder.rs:105:9
  26:     0x562e327dc8c3 - risingwave_stream::common::builder::StreamChunkBuilder::append_record::h41d5bc3b9349e0ac
                               at /risingwave/src/stream/src/common/builder.rs:112:43
  27:     0x562e323bfe13 - risingwave_stream::executor::hash_agg::HashAggExecutor<K,S>::flush_data::{{closure}}::h69a40658dc68653d
                               at /risingwave/src/stream/src/executor/hash_agg.rs:505:42
...

I guess the reason is that an accumulated jsonb value exceeded the max size (2^29 = 512MB). We should either increase the pointer size to 8 bytes to support larger jsonb values, or return an error instead of panic in this case.