feat(authors): add script to list commit authors with years

.mailmap

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+# Proper Name <proper@email.xx> Commit Name <commit@email.xx>
+# See https://git-scm.com/docs/git-blame#_mapping_authors
+Tomasz Słodkowicz <slodki@users.noreply.github.com>
+<slodki> <slodki@users.noreply.github.com>
+Lisheng Guan <guanlisheng@gmail.com> <guanlisheng@7f5d68d0-c712-0410-839f-9b116a576cc5>
+Lisheng Guan <guanlisheng@gmail.com>
+Gabriele Villa <gabriele@villanet.it> <gabriele-v@users.noreply.github.com>
+Gabriele Villa <gabriele@villanet.it> <gabriele@villanet.it>
+Gabriele Villa <gabriele@villanet.it> <Gabriele-V>
+Gabriele Villa <gabriele@villanet.it> <gabriele-v@7f5d68d0-c712-0410-839f-9b116a576cc5>
+James Higley <siena123@mstar.net>
+James Higley <siena123@mstar.net> <siena123@7f5d68d0-c712-0410-839f-9b116a576cc5>
+Stefano Georgio <stef145g@gmail.com>
+Stefano Georgio <stef145g@gmail.com> <stef145g@7f5d68d0-c712-0410-839f-9b116a576cc5>
+Nikolay Akimov <nikolay.akimov@gmail.com>
+Nikolay Akimov <nikolay.akimov@gmail.com> <vomikan@7f5d68d0-c712-0410-839f-9b116a576cc5>
+Nikolay Akimov <nikolay.akimov@gmail.com> <vomikan@mail.ru>
+<dwrj87@gmail.com> <dwrj87@users.noreply.github.com>
+Madhan Kanagavel <madhan> <madhan@7f5d68d0-c712-0410-839f-9b116a576cc5>
+Patrick O'Malley <omalleypat> <omalleypat@users.noreply.github.com>
+Patrick O'Malley <omalleypat> <68omalley@gmail.com>
+Patrick O'Malley <omalleypat> <omalleypat@7f5d68d0-c712-0410-839f-9b116a576cc5>
+Tomáš Frťala <tomas.frtala@gmail.com>
+Tomáš Frťala <tomas.frtala@gmail.com> <tomas.frtala@ardaco.com>
+Tomáš Frťala <tomas.frtala@gmail.com> <tomasfrtala@users.noreply.github.com>
+Yosef Shatsky <ysdevpub@gmail.com>
+Yosef Shatsky <ysdevpub@gmail.com> <yshatsky@gmail.com>
+<jlauria@hotmail.com> <s2108312@users.noreply.github.com>
+Stephen Groat <stephen@egroat.com>
+Stephen Groat <stephen@egroat.com> <stephengroat@users.noreply.github.com>

util/list-authors.sh

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+#!/usr/bin/env bash
+
+declare -A users commits
+
+while IFS=$'|' read -r user year; do
+  [[ ${users[$user]} != *$year* ]] && users[$user]+=" $year"
+  commits[$user]=$((${commits[$user]}+1))
+done < <(git log --all --author-date-order --reverse --date=format:%Y --pretty="format:%aN <%aE>|%ad")
+
+for u in "${!users[@]}"; do echo -e "${users[$u]}\t$u\t${commits[$u]}"; done | sort