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Tiered compaction employs two sliding windows over the keyspace: `KeyspaceWindow` for the image layer generation and `Window` for the delta layer generation. Do some fixes to both windows: * The distinction between the two windows is not very clear. Do the absolute minimum to mention where they are used in the rustdoc description of the struct. Maybe we should rename them (say `WindowForImage` and `WindowForDelta`) or merge them into one window implementation. * Require the keys to strictly increase. The `accum_key_values` already combines the key, so there is no logic needed in `Window::feed` for the same key repeating. This is a follow-up to address the request in https://github.com/neondatabase/neon/pull/7671#pullrequestreview-2051995541 * In `choose_next_delta`, we claimed in the comment to use 1.25 as the factor but it was 1.66 instead. Fix this discrepancy by using `*5/4` as the two operations.