feat(ancestral): Add optional Nextclade GFF3 compatibility mode #2974

Job	Run time
check-docs	37s
pathogen-repo-ci (dengue)	2m 46s
mypy	51s
pathogen-repo-ci (lassa)	51s
pathogen-repo-ci-v0 (avian-flu)	50s
pathogen-repo-ci (measles)	1m 26s
pathogen-repo-ci-v0 (ebola)	59s
pyright	19s
pathogen-repo-ci (mpox)	1m 21s
pathogen-repo-ci-v0 (mumps)	1m 0s
pathogen-repo-ci (seasonal-cov)	1m 48s
pathogen-repo-ci-v0 (ncov)	1m 4s
test (python=3.8 biopython=1.80)	11m 50s
pathogen-repo-ci (zika)	56s
test (python=3.8 biopython=latest)	11m 55s
pathogen-repo-ci-v0 (rsv)	8m 26s
test (python=3.9 biopython=1.80)	12m 6s
pathogen-repo-ci-v0 (seasonal-flu)	1m 18s
test (python=3.9 biopython=latest)	12m 4s
test (python=3.10 biopython=1.80)	12m 6s
pathogen-repo-ci-v0 (tb)	1m 16s
test (python=3.10 biopython=latest)	12m 6s
test (python=3.11 biopython=1.80)	12m 6s
test (python=3.11 biopython=latest)	12m 6s
build-docs / build	2m 7s
codecov	0s
release	0s
rebuild-docker-image	0s
	2h 4m 14s

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