Add dataset name shortcuts

[ivan-aksamentov]

Sibling PR in data: nextstrain/nextclade_data#116 (can be merged independently; no breakage)

This allows to use shortcuts instead of full paths for datasets containing shortcuts array in their pathogen.json:

CLI example:

nextclade run --dataset-name='sc2'
nextclade dataset list --name='sc2'
nextclade dataset list --search='sc2'
nextclade dataset get --name='sc2'

Web example:

https://nextclade-git-feat-dataset-name-shortcuts-nextstrain.vercel.app/?dataset-name=sc2

(these examples assume that there is a dataset which defines a shortcut sc2; in PR nextstrain/nextclade_data#116 this is nextstrain/sars-cov-2/MN908947)

[vercel]

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Name	Status	Preview	Updated (UTC)
nextclade	✅ Ready (Inspect)	Visit Preview	Dec 7, 2023 9:24am