support valueMap() to fetch all properties of vertices

[shirly121]

What do these changes do?

1. support valueMap() in gremlin grammar
2. translate valueMap() to expression '@.~all', and select('a').by(valueMap()) to '@A.~all'

Related issue number

Fixes #1622

[codecov-commenter]

Codecov Report

Merging #1623 (bf95991) into main (b452508) will decrease coverage by 32.90%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #1623       +/-   ##
===========================================
- Coverage   73.18%   40.27%   -32.91%     
===========================================
  Files          89       89               
  Lines        9736     9736               
===========================================
- Hits         7125     3921     -3204     
- Misses       2611     5815     +3204     

Impacted Files	Coverage Δ
python/graphscope/tests/unittest/test_java_app.py	0.00% <0.00%> (-100.00%)	⬇️
...ython/graphscope/tests/unittest/test_cython_ast.py	0.00% <0.00%> (-100.00%)	⬇️
...ython/graphscope/tests/unittest/test_serailaize.py	0.00% <0.00%> (-100.00%)	⬇️
python/graphscope/analytical/udf/patch.py	3.47% <0.00%> (-96.53%)	⬇️
python/graphscope/tests/unittest/test_lazy.py	0.00% <0.00%> (-96.30%)	⬇️
...thon/graphscope/tests/unittest/test_scalability.py	0.00% <0.00%> (-96.16%)	⬇️
python/graphscope/tests/unittest/test_app.py	0.00% <0.00%> (-95.66%)	⬇️
...hon/graphscope/tests/unittest/test_create_graph.py	0.00% <0.00%> (-92.00%)	⬇️
python/graphscope/tests/unittest/test_graph.py	0.00% <0.00%> (-85.41%)	⬇️
python/graphscope/tests/unittest/test_context.py	0.00% <0.00%> (-81.04%)	⬇️
... and 38 more

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