chore: Enable retrieve disk status of store node from client

[siyuan0322]

Add a interface get_store_state() in Connection class that could get the disk status.

>>> conn = gs.conn(grpc_endpoint, gremlin_endpoint)
>>> conn.get_store_state()
{2: totalSpace: 528311816192
usableSpace: 37503909888
, 0: totalSpace: 528311816192
usableSpace: 37503909888
, 1: totalSpace: 528311816192
usableSpace: 37503909888
, 3: totalSpace: 528311816192
usableSpace: 37503909888
}

[codecov-commenter]

Codecov Report

Merging #3274 (56449eb) into main (7314f8c) will increase coverage by 24.10%.
Report is 6 commits behind head on main.
The diff coverage is 25.92%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3274       +/-   ##
===========================================
+ Coverage   42.06%   66.17%   +24.10%     
===========================================
  Files         101      101               
  Lines       10987    11013       +26     
===========================================
+ Hits         4622     7288     +2666     
+ Misses       6365     3725     -2640     

Files	Coverage Δ
python/graphscope/__init__.py	83.33% <100.00%> (+0.47%)	⬆️
python/graphscope/client/rpc.py	71.01% <50.00%> (-2.71%)	⬇️
python/graphscope/client/connection.py	38.59% <42.85%> (+0.27%)	⬆️
python/graphscope/client/session.py	66.72% <11.76%> (+0.46%)	⬆️

... and 65 files with indirect coverage changes

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