Add the swift_feature_allowlist rule that lets toolchains control which packages are allowed to enable/disable specific features.#627

keith merged 2 commits intomasterbazelbuild/rules_swift:masterfrom

ks/add-the-swift_feature_allowlist-rule-that-lets-toolchains-control-which-packages-are-allowed-to-enable-disable-specific-featuresbazelbuild/rules_swift:ks/add-the-swift_feature_allowlist-rule-that-lets-toolchains-control-which-packages-are-allowed-to-enable-disable-specific-featuresCopy head branch name to clipboard