[jeffrey-graham]

Summary

• Updates indexer_ledgers_processed_total (metricLedgersProcessed) in indexer/src/index.ts to increment by the number of ledgers the cursor actually advanced (Math.max(0, nextCursor - previousCursor)), rather than once per non-empty transaction page.
• Adds a separate indexer_pages_processed_total (metricPagesProcessed) counter for non-empty transaction pages.
• Adds unit tests in indexer/src/index.test.ts verifying that advancing the cursor from 100 to 140 records 40 ledgers processed, and that a single ledger split across three pages increments indexer_ledgers_processed_total once and indexer_pages_processed_total three times.

Verification

• Ran npx tsc --noEmit, npm run lint, npm test, and npm run build in indexer/.

Closes #295

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