bootstrap use case attributes are missing

The pmix v5 spec lists the following attributes as "useful to have". Probably we should provide them. Let's check them off as they are provided:

[x] PMIX_NODE_LIST pmix.nlist (char*)
[x] PMIX_NUM_NODES pmix.num.nodes (uint32_t)
[x] PMIX_NODEID pmix.nodeid (uint32_t)
[x] PMIX_JOB_SIZE pmix.job.size (uint32_t)
[ ] PMIX_PROC_MAP pmix.pmap (char*) (we set this in the server - not sure if it's intended for clients?)
[x] PMIX_LOCAL_PEERS pmix.lpeers (char*)
[x] PMIX_LOCAL_SIZE pmix.local.size (uint32_t)
[ ] PMIX_RANK pmix.rank(pmix_rank_t)
[x] PMIX_LOCAL_RANK pmix.lrank (uint16_t)
[ ] PMIX_GLOBAL_RANK pmix.grank (pmix_rank_t)
[ ] PMIX_LOCALITY_STRING pmix.locstr (char*)
[x] PMIX_HOSTNAME pmix.hname (char *)

flux-framework / flux-pmix