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/fez/fez-37-r1.ebuild

@@ -0,0 +1,21 @@
+# Copyright 2020-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="8"
+
+inherit rakudo
+
+DESCRIPTION="Command line tool for uploading distributions to zef ecosystem"
+HOMEPAGE="https://github.com/tony-o/raku-fez"
+SRC_URI="mirror://zef/F/EZ/FEZ/0b19dd84433b44730a15983296b72bd459f4b140.tar.gz -> ${P}.tar.gz"
+LICENSE="Artistic-2"
+SLOT="0"
+KEYWORDS="~amd64"
+RESTRICT="primaryuri"
+DOCS="README.md"
+S="${WORKDIR}/dist"
+
+src_install() {
+	rakudo_src_install
+	rakudo_symlink_bin fez
+}