PYTHON-4347 Improve performance by only calling get_topology once

[ShaneHarvey]

https://jira.mongodb.org/browse/PYTHON-4347

TODO:

• Benchmark locally

(pymongo-py39) ➜  mongo-python-driver git:(PYTHON-4347-simple) python bench-command.py 100
Python: 3.9.13, PyMongo: 4.8.0.dev1, MongoDB: 5.0.15
Running 10000 operations across 100 thread(s)
command: 1.09s
find_one: 1.42s
insert_one: 1.29s

vs master:

$ python bench-command.py 100
Python: 3.9.13, PyMongo: 4.8.0.dev1, MongoDB: 5.0.15
Running 10000 operations across 100 thread(s)
command: 1.26s
find_one: 1.51s
insert_one: 1.34s

1 thread:

(pymongo-py39) ➜  mongo-python-driver git:(PYTHON-4347-simple) python bench-command.py 1  
Python: 3.9.13, PyMongo: 4.8.0.dev1, MongoDB: 5.0.15
Running 10000 operations across 1 thread(s)
command: 1.25s
find_one: 1.86s
insert_one: 1.81s

vs master:

python bench-command.py 1
Python: 3.9.13, PyMongo: 4.8.0.dev1, MongoDB: 5.0.15
Running 10000 operations across 1 thread(s)
command: 1.42s
find_one: 1.99s
insert_one: 1.89s

• Run perf benchmarks: https://performance-analyzer.server-tig.prod.corp.mongodb.com/perf-analyzer-viz/?comparison_id=f3eef3ba-4c9b-4933-83f1-5dc7d50a8582&selected_tab=data-table&percent_filter=0%7C%7C100&z_filter=0%7C%7C10

[caseyclements]

LGTM