nbari / pg_exporter / 28188467472

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checkpoint tuning metrics and sqlx 0.9 dependency upgrade

Metrics:
- Add pg_last_checkpoint_age_seconds and pg_wal_bytes_since_last_checkpoint
  (from pg_control_checkpoint(), all supported PG versions)
- Expose pg_settings_max_wal_size_bytes and pg_settings_min_wal_size_bytes

Dashboard / docs:
- Add Grafana "Checkpoints" section (4 panels) with live setting overlay lines
- Add checkpoint tuning guide (src/collectors/default/README.md)

Dependencies:
- Upgrade sqlx 0.8 -> 0.9, tower-http 0.6 -> 0.7, OpenTelemetry stack 0.31 -> 0.32,
  tracing-opentelemetry 0.32 -> 0.33, sysinfo 0.38 -> 0.39, and compatible bumps
- Adapt dynamic SQL to sqlx 0.9 SqlSafeStr via AssertSqlSafe; enable serde derive
- Fix connection-collector test deadlock under sqlx 0.9 Pool::close semantics

Prepare CHANGELOG for 0.12.0 (version bump left to just bump-minor).

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