Project: datamanagement
Issue DM-6302: Wrap pex_exceptions with pybind11
While wrapping these packages, pay particular attention to exception translation (see Jim's bullet point 3: https://jira.lsstcorp.org/browse/RFC-182?focusedCommentId=48644&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-48644).
Story points: 4