Completely drop `RootModel` from `types` module #205

Job	Run time
checks / pre-commit	34s
checks / readme-snippets	13s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / test (3.11, locked, ubuntu-latest)	43s
checks / test (3.12, locked, windows-latest)	3m 12s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.13, locked, windows-latest)	2m 28s
checks / test (3.10, locked, windows-latest)	2m 12s
checks / test (3.13, lowest-direct, ubuntu-latest)	43s
checks / test (3.11, locked, windows-latest)	2m 28s
checks / test (3.14, lowest-direct, windows-latest)	2m 17s
checks / test (3.11, lowest-direct, windows-latest)	2m 37s
checks / test (3.12, lowest-direct, windows-latest)	3m 34s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.14, locked, windows-latest)	3m 41s
checks / test (3.11, lowest-direct, ubuntu-latest)	45s
checks / test (3.10, lowest-direct, windows-latest)	2m 13s
checks / test (3.14, locked, ubuntu-latest)	2m 10s
checks / test (3.13, lowest-direct, windows-latest)	2m 57s
checks / test (3.13, locked, ubuntu-latest)	41s
checks / test (3.10, locked, ubuntu-latest)	45s
all-green	5s
	38m 1s

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