ksmbd: add procfs monitoring for active shares

There is no kernel-side view of the share configurations currently cached
by active tree connections.

Add a shares proc entry that reports each active share name, type,
tree-connection count, create masks, and descriptive configuration flags.
Maintain a per-share tree-connection counter with the existing global
counter so the value can be read without walking every session.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

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