feat: Add type annotations #301

Job	Run time
skip-linters (debian:bookworm-slim)	21s
install (debian:bookworm-slim)	18s
skip-linters (debian:testing-slim)	23s
system-testing (debian:testing-slim)	2m 41s
install (debian:testing-slim)	20s
skip-linters (debian:unstable-slim)	20s
system-testing (debian:unstable-slim)	2m 30s
unittest (debian:bookworm-slim)	27s
install (debian:unstable-slim)	21s
skip-linters (ubuntu:jammy)	24s
system-testing (ubuntu:jammy)	3m 23s
install (ubuntu:jammy)	24s
unittest (debian:testing-slim)	23s
skip-linters (ubuntu:noble)	24s
system-testing (ubuntu:noble)	3m 16s
install (ubuntu:noble)	25s
skip-linters (ubuntu:oracular)	27s
system-testing (ubuntu:oracular)	2m 32s
unittest (debian:unstable-slim)	25s
install (ubuntu:oracular)	18s
unittest (ubuntu:jammy)	41s
unittest (ubuntu:noble)	34s
yamllint	14s
unittest (ubuntu:oracular)	29s
upload-to-codecov	7s
	22m 7s

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