For each extension whose requirement is not NA_character_, checks that the
package is installed and up-to-date, installs or upgrades via
pak::pkg_install() if install = TRUE, then calls loadNamespace().
ensureExtensionNamespaces(extensions, install = FALSE)Invisibly TRUE.
Named character vector of extensions.
Logical. If TRUE, install or upgrade missing/outdated
packages via pak::pkg_install().