[java-bigtable] Add the ability to get Row cells in serverside order

Bigtable stores data in the following order:
1. lexicographically by row key
2. family creation order
3. lexicographically by qualifier
4. reverse chronological by timestamp

The family ordering is not guaranteed so the data client currently pre-processes each row to change the ordering of families to be lexicographic order. This makes it convenient to do binary searches for specific values.

Unfortunately, this has negative repercussions when combined with `cells_per_row_limit_filter` and `cells_per_row_offset_filter`. Those filters are executed on the server side using the family creation order.

At the very least we need to update our docs to caution users against using those filters outside of a chain that narrows it to a single family.

In addition we should expose the server ordering of the cells on each row as `Row#getRawCells()` (maybe with a better name).

从 Row API 开始，追踪 cells_per_row_limit_filter 和 cells_per_row_offset_filter 如何与客户端的 family 重排序交互。检查现有的这些 filter 以及 Row 行为文档。完成标准是记录单 family 限制，并且如果继续推进 API 更改，则通过命名清晰的 Row 方法暴露服务器顺序的 cells。

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