feat: Add immiscible water flash model #6861

Job	Run time
semantic_pull_request	3s
is_not_draft_pull_request	6s
are_submodules_in_sync	9s
baseline_log	6s
if_not_unassigned_pull_request	23s
code_coverage / build_test_deploy	45m 32s
Check code style / build_test_deploy	1m 21s
Check documentation / build_test_deploy	1m 8s
Ubuntu (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	4m 47s
Ubuntu (20.04, gcc 9.4.0, open-mpi 4.0.3) / build_test_deploy	5m 14s
Ubuntu (22.04, clang 15.0.7, open-mpi 4.1.2) / build_test_deploy	4m 5s
Ubuntu (22.04, gcc 11.4.0, open-mpi 4.1.2) / build_test_deploy	5m 34s
Ubuntu (22.04, gcc 12.3.0, open-mpi 4.1.2) / build_test_deploy	4m 57s
Ubuntu debug (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	9m 56s
Ubuntu CUDA (20.04, clang 10.0.0 + gcc 9.4.0, open-mpi 4.0.3, cuda-11.8.89) / build_test_deploy	3m 39s
Ubuntu CUDA debug (20.04, clang 10.0.0 + gcc 9.4.0, open-mpi 4.0.3, cuda-11.8.89) / build_test_deploy	4m 6s
run_integrated_tests / build_test_deploy	6s
check_that_all_jobs_succeeded	1s
	1h 31m 13s

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