Add support for user-defined JS Hooks #560

Job	Run time
quality: OTP 27 \| Elixir 1.18 \| Phoenix ~> 1.7 \| LV ~> 1.0	2m 30s
test: OTP 23 \| Elixir 1.14.0 \| Phoenix 1.7.0 \| LV 0.20.2 \| PG 13.0-alpine	3m 2s
test: OTP 27 \| Elixir 1.18 \| Phoenix ~> 1.7 \| LV ~> 1.0 \| PG 16.4-alpine	3m 32s
	9m 4s

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