Optimize ScyllaDB usage (#3985)

## Motivation

There are some optimization that we can do in how we're using ScyllaDB

## Proposal

This PR removes the use of:
* Non token aware queries
* Unpaged queries
* Most usages of `ALLOW FILTERING` (the ones remaining should be fine)
* Non prepared statements

Also:
* Tuned page creation and other settings a bit
* Some refactoring/code cleanup

## Test Plan

CI + deployed a network, benchmarked it, and saw an over 10x decrease in ScyllaDB`s write latency

## Release Plan

- Nothing to do / These changes follow the usual release cycle.

Author: ndr-ds

Cargo.lock

@@ -6,3 +6,4 @@ metadata:
 data:
   scylla.yaml: |
     query_tombstone_page_limit: 200000
+    commitlog_segment_size_in_mb: 256

examples/Cargo.lock

@@ -37,6 +37,7 @@ aws-sdk-dynamodb = { workspace = true, optional = true }
 aws-smithy-types = { workspace = true, optional = true }
 bcs.workspace = true
 convert_case.workspace = true
+dashmap.workspace = true
 derive_more = { workspace = true, features = ["from"] }
 futures.workspace = true
 generic-array.workspace = true