fix: enforce fn-head nested parens at parse time #328

Job	Run time
Tests	1m 15s
Lint	1m 39s
Repos (elixir-lang/elixir)	1m 16s
Repos (phoenixframework/phoenix)	1m 17s
Repos (bitwalker/timex)	1m 9s
Repos (nerves-hub/nerves_hub_web)	1m 18s
Repos (witchcrafters/quark)	1m 6s
Repos (livebook-dev/kino)	1m 7s
Repos (rrrene/credo)	1m 13s
Repos (phoenixframework/phoenix_live_view)	1m 23s
Repos (absinthe-graphql/absinthe)	1m 7s
Repos (wojtekmach/req)	1m 3s
Repos (ericmj/decimal)	1m 14s
Repos (beam-telemetry/telemetry)	1m 17s
Repos (livebook-dev/vega_lite)	1m 4s
Repos (sorentwo/oban)	1m 6s
Repos (elixir-ecto/ecto)	1m 9s
Repos (elixir-tools/gen_lsp)	1m 0s
Repos (ash-project/ash)	1m 16s
Repos (elixir-tools/next-ls)	1m 2s
Repos (mtrudel/bandit)	1m 9s
Repos (elixir-makeup/makeup)	1m 10s
Repos (elixir-wallaby/wallaby)	1m 18s
Repos (witchcrafters/witchcraft)	1m 9s
Repos (michalmuskala/jason)	1m 9s
Repos (witchcrafters/type_class)	1m 9s
Repos (elixir-plug/plug)	1m 14s
Repos (elixir-tools/tableau)	58s
Repos (elixir-gettext/gettext)	59s
Repos (elixir-ecto/ecto_sql)	58s
Repos (oestrich/aino)	1m 14s
Repos (elixir-tools/spitfire)	1m 23s
Repos (livebook-dev/livebook)	1m 13s
Repos (mishka-group/guarded_struct)	1m 1s
Repos (nerves-hub/nerves_hub_link)	1m 20s
	41m 25s

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