add partitioning to pg_telemetry SimpleMetric model

[matt-codecov]

we want to add partitioning to this model but it's tricky because the model already exists. will probably need to hand-write some migrations to handle this

see this GH issue on the topic:
https://github.com/SectorLabs/django-postgres-extra/issues/221

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.51%. Comparing base (bf76a73) to head (a012988).

❗ Current head a012988 differs from pull request most recent head d290285

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #241      +/-   ##
==========================================
- Coverage   89.98%   89.51%   -0.47%     
==========================================
  Files         331      324       -7     
  Lines       10540    10284     -256     
  Branches     1925     1873      -52     
==========================================
- Hits         9484     9206     -278     
- Misses       1000     1008       +8     
- Partials       56       70      +14     

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