tarantool / sharded-queue / 8411782711

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api: add more metrics

* Metric `tnt_sharded_queue_api_role_stats` is a summary[1] with
  quantiles of `sharded_queue.api` role API calls.
  The metric includes a counter of API calls and errors.
  The metric contains labels in the following format:
  `{name = "tube_name", method = "api_call_method", status = "ok" or "error"}`

* Metric `tnt_sharded_queue_storage_role_stats` is a summary[1] with
  quantiles of `sharded_queue.storage` role API calls.
  The metric includes a counter of API calls and errors.
  The metric contains labels in the following format:
  `{name = "tube_name", method = "api_call_method", status = "ok" or "error"}`

* Metric `tnt_sharded_queue_storage_statistics_calls_total` as
  an equivalent of `tnt_sharded_queue_api_statistics_calls_total`
  for the `sharded_queue.storage` role.
  Values have the same meaning as the `queue` statistics `calls`
  table[2].
  The metric contains labels in the following format:
  `{name = "tube_name", state = "call_type"}`

* Metric `tnt_sharded_queue_storage_statistics_tasks` as an
  equivalent of `tnt_sharded_queue_api_statistics_tasks` for
  the `sharded_queue.storage` role.
  Values have the same meaning as the `queue` statistics `tasks`
  table[2].
  The metric contains labels in the following format:
  `{name = "tube_name", state = "task_state"}`

* Metric `sharded_queue_calls` renamed to
  `tnt_sharded_queue_api_statistics_calls_total` The metric now has
  labels in the format `{name = "tube_name", state = "call_type"}`
  instead of `{name = "tube_name", status = "call_type"}`.

* Metric `sharded_queue_tasks` renamed to
  `tnt_sharded_queue_api_statistics_tasks`. The metric now has labels
  in the format `{name = "tube_name", state = "task_state"}` instead of
  `{name = "tube_name", status = "task_state"}`.

1. https://github.com/tarantool/metrics/?tab=readme-ov-file#summary
2. https://github.com/tarantool/queue?tab=readme-ov-file#getting-statistics

Closes #69
Closes #71

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