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refs: add 'update-symref' command to 'update-ref'

Karthik Nayak requested to merge 261-support-transactional-symbolic-reference-updates into next 
refs: add 'update-symref' command to 'update-ref'

The 'git-update-ref(1)' command allows transactional reference updates.
But currently only supports regular reference updates. Meaning, if one
wants to update HEAD (symbolic ref) in a transaction, there is no tool
to do so.

One option to obtain transactional updates for the HEAD ref is to
manually create the HEAD.lock file and commit. This is intrusive, where
the user needs to mimic internal git behavior. Also, this only works
when using the files backend.

To allow users to update the HEAD ref in a transaction, we introduce
'update-symref' command for 'git-update-ref(1)'. This command allows the
user to create symref in a transaction similar to the 'update' command
of 'git-update-ref(1)'. This command also works well with the existing
'no-deref' option.

Related to #261 (closed)

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