v2.4.2

IMPROVEMENTS

• add cpu_nice_priority and io_nice_priority to general config section, which allow us to throttle CPU and IO usage for the whole clickhouse-backup process, fix 757

BUG FIXES

• fix restore for object disk frozen_metadata.txt fix 752
• fix more corner cases for check_parts_columns: true, fix 747
• fix applying macros to s3 endpoint in object disk during restore embedded backups, fix 750
• rewrite GCS clients pool, set default GCS_CLIENT_POOL_SIZE as max(upload_concurrency, download_concurrency) * 3 to avoid stuck, fix 753, thanks @minguyen-jumptrading