refactor: replace lowlevel Server decorators with on_* constructor kwargs #575

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	31s
checks / test (3.10, locked, windows-latest)	6m 20s
checks / test (3.10, lowest-direct, windows-latest)	5m 31s
checks / test (3.11, lowest-direct, windows-latest)	5m 26s
checks / test (3.11, lowest-direct, ubuntu-latest)	4m 52s
checks / test (3.11, locked, ubuntu-latest)	4m 54s
checks / test (3.12, lowest-direct, ubuntu-latest)	4m 59s
checks / test (3.12, locked, ubuntu-latest)	5m 0s
checks / test (3.11, locked, windows-latest)	5m 28s
checks / test (3.13, locked, windows-latest)	6m 22s
checks / test (3.10, locked, ubuntu-latest)	4m 51s
checks / test (3.14, lowest-direct, windows-latest)	6m 25s
checks / test (3.13, lowest-direct, ubuntu-latest)	5m 31s
checks / test (3.12, locked, windows-latest)	6m 5s
checks / test (3.13, lowest-direct, windows-latest)	5m 39s
checks / test (3.10, lowest-direct, ubuntu-latest)	4m 54s
checks / test (3.13, locked, ubuntu-latest)	5m 32s
checks / test (3.12, lowest-direct, windows-latest)	6m 6s
checks / test (3.14, locked, windows-latest)	6m 31s
checks / test (3.14, locked, ubuntu-latest)	6m 12s
checks / test (3.14, lowest-direct, ubuntu-latest)	5m 12s
all-green	5s
	1h 52m 38s

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