Introduce `Beacon.LiveAdmin.Config` #596

Job	Run time
quality: OTP 27 \| Elixir 1.17 \| Phoenix ~> 1.7 \| LV 1.0.0-rc.7	31s
test: OTP 25.1 \| Elixir 1.14.0 \| Phoenix 1.7.0 \| LV 0.20.2 \| PG 13.0-alpine	45s
e2e-test: OTP 27 \| Elixir 1.17 \| Phoenix ~> 1.7 \| LV 1.0.0-rc.7 \| PG 16.4-alpine	2m 18s
test: OTP 27 \| Elixir 1.17 \| Phoenix ~> 1.7 \| LV 1.0.0-rc.7 \| PG 16.4-alpine	48s
	4m 22s

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