[Feature] Add UUID v7 column support to ClickHouse plugin

[Feature] Add UUID v7 column support to ClickHouse plugin

Add TaskUUID column with Delta compression codec for efficient storage
of time-ordered UUID v7 values generated natively by Rspamd.

- Add enable_uuid setting (default: false)
- Add TaskUUID UUID CODEC(Delta, LZ4) column to schema
- Add migration from schema version 9 to 10
- Collect UUID via task:get_uuid() when enabled

Delta compression is effective for UUIDv7 due to its 48-bit millisecond
timestamp prefix ensuring monotonic ordering.