improvement!: rewrite relationship route handling #518

Job	Run time
ash-ci / mix deps.get	19s
ash-ci / mix hex.audit	20s
ash-ci / MIX_ENV=test mix.compile	1m 39s
ash-ci / MIX_ENV=dev mix.compile	1m 29s
ash-ci / mix sobelow	31s
ash-ci / mix spark.formatter --check	31s
ash-ci / mix spark.cheat_sheets --check	21s
ash-ci / mix format --check-formatted	33s
ash-ci / mix dialyzer	3m 20s
ash-ci / mix credo --strict	24s
ash-ci / mix test	1m 2s
ash-ci / mix deps.unlock --check-unused	24s
ash-ci / Release	0s
	10m 53s

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