perf: improve bson iteration performance #6131

Job	Run time
Build	2m 23s
Lint (clippy)	4m 37s
Node.js Binding Tests	4m 26s
Cache Maintenance	0s
Format (rustfmt +nightly)	16s
PG Protocol Tests	20s
Process Integration Tests (pytest)	1m 14s
Python Binding Tests	6m 29s
SQL Logic Tests (postgres)	18s
SQL Logic Tests (flightsql)	26s
Unit Tests	6m 6s
SQL Logic Tests (rpc)	11s
MinIO Integration Tests (SLT::MinIO)	2m 58s
Service Integration Tests (SLT)	2m 52s
Datasource Integration (Clickhouse)	2m 36s
Build and Push Docker Image	0s
Datasource Integration (SQLite)	2m 45s
Datasource Integration (Cassandra)	2m 12s
Datasource Integration (MySQL)	2m 57s
Datasource Integration (MongoDB)	42s
Datasource Integration (SQLServer)	9m 36s
Datasource Integration (PostgreSQL)	2m 21s
Snowflake Integration Tests (SLT::Snowflake)	2m 16s
	58m 1s

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