[Eva] Domains: renames return_context into build_context.

src/plugins/eva/domains/abstract_domain.ml

src/plugins/eva/domains/cvalue/cvalue_domain.ml

src/plugins/eva/domains/cvalue/cvalue_queries.ml

src/plugins/eva/domains/domain_builder.ml

src/plugins/eva/domains/domain_builder.mli

src/plugins/eva/domains/domain_lift.ml

src/plugins/eva/domains/domain_product.ml

src/plugins/eva/domains/equality/equality_domain.ml

src/plugins/eva/engine/evaluation.ml

src/plugins/eva/partitioning/auto_loop_unroll.ml