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This PR adds support for limiting the maximum shares allocated to a compaction scheduling class by the compaction controller. It introduces a new configuration parameter, compaction_max_shares, which, when set to a non zero value, will cap the shares allocated to compaction jobs. This PR also exposes the shares computed by the compaction controller via metrics, for observability purposes. Fixes https://github.com/scylladb/scylladb/issues/9431 Enhancement. No need to backport. NOTE: Replaces PR https://github.com/scylladb/scylladb/pull/26696 Ran a test in which the backlog raised the need for max shares (normalized backlog above normalization_factor), and played with different values for new option compaction_max_shares to see it works (500, 1000, 2000, 250, 50) Closes scylladb/scylladb#27024 * github.com:scylladb/scylladb: db/config: introduce new config parameter `compaction_max_shares` compaction_manager:config: introduce max_shares compaction_controller: add configurable maximum shares compaction_controller: introduce `set_max_shares()`