Add some missing attributes and one API for server support

[rhc54]

There are a few attributes servers need in order to support
singleton operations as well as user-specified time limits
on job and spawn operations. Current server module functions
do not include the ability for the server library to pass
a local status from a collective operation (i.e., when the
server library aggregates all local participation before
calling the host)

Add a few job-related error constants for clear reporting
to the user.

Add a useful variant of a data management function.

Signed-off-by: Ralph Castain rhc@pmix.org

[rhc54]

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[jjhursey]

PMIx ASC 1Q 2022

• Passed the first vote: 11 yes / 0 no / 0 abstain
• This is can be merged into main/v5 and v4 branches (I'll work on that)

[jjhursey]

Editorial: Rebased the reference branch without text changes to prepare to merge.