improvement: add support for decimal serialization #1148

Job	Run time
ash-ci / Report Mix Dependencies	14s
ash-ci / mix igniter.upgrade	5s
ash-ci / MIX_ENV=test mix.compile	35s
ash-ci / audit	51s
ash-ci / mix spark.formatter --check	35s
ash-ci / mix format --check-formatted	30s
ash-ci / mix spark.cheat_sheets --check	48s
ash-ci / mix test	1m 7s
ash-ci / MIX_ENV=dev mix.compile	26s
ash-ci / mix dialyzer	4m 22s
ash-ci / mix credo --strict	31s
ash-ci / mix sobelow	27s
ash-ci / mix deps.unlock --check-unused	25s
ash-ci / mix ash.codegen --check	-1s
ash-ci / mix docs	2m 11s
ash-ci / Deploy docs to GitHub pages.	8s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	0s
	13m 14s

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