feat(mean_field): added dimensions, discritization, and start of eos

The full rewrite of mean_field into something maintainable is progressing. dimensions is mostly done, discritization (domain, blocks, and fields) is done, and eos is progressing quickly

tests/discritization/domain/schema/domain_schema.cpp

@@ -0,0 +1,55 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include "serif/discretization/domain/ids/boundary.hpp"
+#include "serif/discretization/domain/ids/domain.hpp"
+#include "serif/discretization/domain/ids/lists/lists.hpp"
+#include "serif/discretization/domain/physical_domains.hpp"
+#include "serif/discretization/domain/relation/lists/relation_list.hpp"
+#include "serif/discretization/domain/relation/relations.hpp"
+#include "serif/discretization/domain/schema/domain_schema.hpp"
+#include "serif/discretization/domain/types.hpp"
+
+#include "serif/tests/test_tags.hpp"
+#include "serif/tests/discritization/domain/domain_test_utils.hpp"
+
+namespace domain   = serif::discretization::domain;
+namespace ids      = domain::ids;
+namespace relation = domain::relation;
+
+TEST_CASE(
+    "Domain Schemas Reject Relations That Reference Unregistered Entities",
+    tags::unit &tags::mesh &tags::utils &tags::domain
+) {
+    using IncompleteDomainIDs = ids::lists::DomainIDList<
+        ids::DomainID<domain::CoreDomain, 1>,
+        ids::DomainID<domain::VacuumDomain, 3>>;
+
+    using CompleteDomainIDs = ids::lists::DomainIDList<
+        ids::DomainID<domain::CoreDomain, 1>,
+        ids::DomainID<domain::EnvelopeDomain, 2>,
+        ids::DomainID<domain::VacuumDomain, 3>>;
+
+    using CompleteBoundaryIDs = ids::lists::BoundaryIDList<
+        ids::BoundaryID<domain::StellarSurfaceBoundary, 1>,
+        ids::BoundaryID<domain::InfinitySurfaceBoundary, 2>>;
+
+    using InfinityOnlyBoundaryIDs = ids::lists::BoundaryIDList<
+        ids::BoundaryID<domain::InfinitySurfaceBoundary, 2>>;
+
+    using MissingEnvelopeRelation = relation::lists::RelationList<
+        relation::FullyConnected<domain::EnvelopeDomain>>;
+
+    using MissingBoundaryRelation = relation::lists::RelationList<relation::DomainBoundary<
+        domain::StellarSurfaceBoundary, domain::StellarDomains,
+        domain::VacuumDomain>>;
+
+    STATIC_REQUIRE_FALSE(
+        domain_test_utils::CanFormSchema<IncompleteDomainIDs, CompleteBoundaryIDs, MissingEnvelopeRelation>
+    );
+
+    STATIC_REQUIRE_FALSE(
+        domain_test_utils::CanFormSchema<CompleteDomainIDs, InfinityOnlyBoundaryIDs, MissingBoundaryRelation>
+    );
+
+    CHECK(true);
+}