[ThCompiler]

Extend driver API:

Added the optional consumer_group driver API so a driver can wake a consumer waiting for the same logical group instead of waking an unrelated consumer.

Added custom statistics for drivers to support showing custom statistics by them.

Subqueuettl:

Some workloads need to create queues dynamically with arbitrary names. Creating a separate tube for each queue requires converting those names to valid Tarantool space names and granting access whenever a new tube is created. This adds operational overhead and makes access management harder.

The utube model is otherwise well suited for this use case: it stores multiple logical queues in one space and guarantees sequential processing inside each queue. However, it does not support taking a task from a specific utube, so it cannot be used when consumers must be assigned to particular dynamically named queues.

Added subqueuettl as a TTL-aware alternative. It stores multiple dynamically named subqueues in one space, and both put() and take() require a subqueue name. This keeps task selection isolated while retaining TTL, TTR, priority, delay, and ready-buffer support.

If you don’t think it’s necessary to add this driver to the general library, I can remove it from this PR, but for my purposes, I need support for changes in the “abstract.lua” in order to use this driver.

[ThCompiler]

I added registry cleanup in case there are no tasks left in the subqueue, which may mean that the subqueue is no longer in use.

[patapenka-alexey]

Please, remove trailing whitespaces from queue/abstract/driver/subqueuettl.lua lines: 63, 75, 77, 146, 190, 206, 235, 397, 467, 468, 469, 497, 599.
Also, README.md:1061 documents tube:take([opts]) while the signature is take([timeout[, opts]]).
And update the third commit message according to the rules.

[ThCompiler]

The project doesn't have a CONTRIBUTE.md file with commit message guidelines. I fixed the message by trying to follow the tarantool/tarantool guidelines.

[ThCompiler]

I think we should restart the failed jobs. Tarantool could not be loaded due to a network error.

  E: Failed to fetch https://download.tarantool.org/tarantool/release/1.10/ubuntu/pool/jammy/main/t/tarantool/tarantool-common_1.10.15.0.ge14d0b4ea-1_all.deb  Could not connect to download.tarantool.org:443 (95.163.41.75), connection timed out
  E: Failed to fetch https://download.tarantool.org/tarantool/release/1.10/ubuntu/pool/jammy/main/t/tarantool/tarantool_1.10.15.0.ge14d0b4ea-1_amd64.deb  Unable to connect to download.tarantool.org:https:
  E: Failed to fetch https://download.tarantool.org/tarantool/release/1.10/ubuntu/pool/jammy/main/t/tarantool/tarantool-dev_1.10.15.0.ge14d0b4ea-1_amd64.deb  Unable to connect to download.tarantool.org:https:
  E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Second failed with a strange error:

I also created the same PR in the fork. The workflow completed successfully.
https://github.com/ThCompiler/queue/actions/runs/39421625804/job/118623725648?pr=2