Add rakudo.eclass and dev-raku/*

rakudo.eclass requires install-dist.raku installed by a modified version
of dev-lang/rakudo. Gentoo overlay's dev-lang/rakudo doesn't install
install-dist.raku.

rakudo.eclass is minimal and elegant. dev-raku/* packages depend on
rakudo.eclass.

Signed-off-by: amano.kenji <amano.kenji@proton.me>

dev-raku/Distribution-Builder-MakeFromJSON/Distribution-Builder-MakeFromJSON-0.6-r2.ebuild

@@ -0,0 +1,17 @@
+# Copyright 2020-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="8"
+
+inherit rakudo
+
+DESCRIPTION="Makefile based distribution builder"
+HOMEPAGE="https://raku.land/cpan:NINE/Distribution::Builder::MakeFromJSON"
+SRC_URI="mirror://cpan/authors/id//N/NI/NINE/Perl6/${P}.tar.gz"
+LICENSE="Artistic-2"
+SLOT="0"
+KEYWORDS="~amd64"
+RESTRICT="primaryuri"
+RDEPEND="dev-raku/System-Query"
+DEPEND="${RDEPEND}"
+DOCS="README.md Changes"