read replicas

[eoin-obrien]

• test: add test case for compatibility with @prisma/extension-read-replicas
• docs: document compatibility with @prisma/extension-read-replicas and add example

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (7ab9071) to head (16f3c83). Report is 6 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #157 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 3 3 Lines 54 54 Branches 8 8 ========================================= Hits 54 54 ```

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