Add DbfWriter and refactor Writer to use it #167

Job	Run time
build_wheel_and_sdist	15s
run_speed_tests (3.9, ubuntu-24.04)	22s
run_speed_tests (3.13, ubuntu-24.04)	14s
run_speed_tests (3.9, windows-latest)	1m 16s
run_speed_tests (3.13, windows-latest)	41s
	2m 48s

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