Increase load_metadata_threads to 16

[alexey-milovidov]

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Increase load_metadata_threads to 16 for the filesystem cache. It will make the server start up faster.

[robot-ch-test-poll3]

This is an automated comment for commit f0fb615 with description of existing statuses. It's updated for the latest CI running

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[kssenii]

But if cache directory is really small, it will slow down the load. (I checked). Therefore I left it as 1 by default. Do not remember exact numbers now, but probably we can neglect it...