fix: move blocking io ops to async method on dbservice init

[jordanrfrazier]

Moves blocking IO operations to an async method to avoid blocking event loop

[codspeed-hq]

CodSpeed Performance Report

Merging #5291 will degrade performances by 19.66%

_{Comparing fix-blocking-io-ops (1d7d51c) with main (a97c29f)}

Summary

❌ 1 regressions
✅ 14 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	fix-blocking-io-ops	Change
❌	test_get_and_cache_all_types_dict	1.1 ms	1.4 ms	-19.66%