feat: Simplify Barrage Viewport Table Updates

[deephaven-internal]

This issue was auto-generated

PR: deephaven/deephaven-core#6347
Author: nbauernfeind

Original PR Body

Fixes #6039.
Fixes #6053.

The barrage viewport protocol has now changed:

• viewports are never sent included rows; all added rows are included
• added rows are position space from within the server-respected client requested viewport
• removed rows are position space from within the server-respected client requested viewport
• snapshots on viewports include removed rows to simplify client side processing
• barrage update metadata now explicitly includes current table size; viewports no longer track the source table's full rowset

viewport clients must infer shifts:

• removed rows are in pre-update space
• added rows are in post-update space
• the end-result viewport is retained rows + added rows (retained are the existing rows minus removed rows) where the adds are in the offsets specified by added rows

In this PR we'll bump the following dependencies:

• flatbuffer from 1.12.0 to 24.3.25
• arrow from 13.0.0 to 18.0.0
• protobuf 3.25.3 to 3.25.4
• barrage from 0.6.0 to 0.7.2 (noting that 0.7.x was released for this feature set)