refactor!: add small tick hits

[MaxOhn]

If users use the osu! api they're provided score statistics containing slider tail hits and small tick hits. Instead of requiring users to check for themselves which one of the two they need to pass to the slider_tail_hits method, there is now a small_tick_hits methods so rosu_pp can pick the correct value automatically.

There's also breaking changes:

• OsuPerformance::n_large_ticks has been renamed to large_tick_hits
• OsuPerformance::n_slider_ends has been renamed to slider_end_hits
• Performance::n_slider_ends has been renamed to slider_end_hits
• OsuScoreState has an additional field small_tick_hits
• ScoreState has an additional field osu_small_tick_hits
• OsuScoreState is no longer Copy