[bug#44926] [WIP] Add dart-2.8.4

[Nicolò Balzarotti]

Hi Guix!
As announced on guix-devel, I bootstrapped the dart compiler from
source.

Following patches add dart 2.8.4 (latest release is 2.10, but I wanted
to be sure that this work in progress is fine before continuing, as I
fear that 4 other steps are required).

NOTE: I tagged this as WIP as I've not yet disabled analytics yet (I
disabled it from the first added version, but I was wondering if I need
to disable it in _each_ version or if just the latest one is fine.
Patching all of them will require some time).

(Each build takes ~20min on my server and ~60min on my laptop, and
there's a dozen of them)

Let me know if there are major problems or if I can go on with disabling
analytics!

Thanks, Nicolò

0001-gnu-Add-gn-for-dart-bootstrap.patch
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0002-gnu-packages-dart.scm-New-file.patch
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0003-gnu-dart-Add-dart-zlib.patch
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0004-gnu-packages-Add-dart-boringssl.patch
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0005-gnu-packages-Add-boringssl-gen.patch
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0006-gnu-dart-Add-dart-gperftools.patch
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0007-gnu-dart-Add-root-certificates.patch
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0008-gnu-Add-dart-2.0.0-dev.8.0.patch
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0009-gnu-Add-dart-2.0.0-dev.20.0.patch
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0010-gnu-dart.scm-Add-helper-function.patch
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0011-gnu-Add-dart-2.0.0-dev.36.0.patch
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0012-gnu-Add-dart-2.0.0-dev.54.0.patch
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0013-gnu-Add-dart-2.0.0-dev.65.0.patch
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0014-gnu-Add-dart-2.1.0-dev.5.0.patch
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0015-gnu-Add-dart-2.1.0-dev.6.0.patch
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0016-gnu-Add-dart-2.4.0.patch
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0017-gnu-Add-dart-2.5.0.patch
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0018-gnu-Add-dart-2.6.1.patch
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0019-gnu-Add-dart-2.7.2.patch
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0020-gnu-Add-dart-2.8.4.patch
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