Add datatype definition for AGP assemblies

[davebx]

This adds support for the "A Golden Path" 2.0 assembly file format created by NCBI, as requested at the VGP meeting earlier this week.

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[bgruening]

It's tailing @davebx ... maybe a pure subclass datatype is enough. Do we expect many upload of that type that we need a sniffer?

[davebx]

@bgruening I have a fix for the upload datatype test on my local branch, and I'm also almost done with a data provider for the datatype.

[davebx]

Thanks for the feedback, @davelopez, this type annotation stuff is new to me.

[bgruening]

@davebx @mvdbeek would it be possible to get this into the next release. Usually that is ok for normal data types, this touches a little bit more.

[gallardoalba]

Is it already finished? @davebx

[bgruening]

Should we apply this to 21.09? Merge is dev and backport?

[bgruening]

@davebx can you get this into 21.09?

[bgruening]

We would need this for the Biohackathon. @davebx any change to get this fixed today?

[bernt-matthias]

Seems that this is already in https://github.com/galaxyproject/galaxy/pull/12891