Enable to connect to the existed ETCD cluster in GraphScope

[wuyueandrew]

What do these changes do?

add new start param etcd_addrs to specify etcd ,such as

     --k8s_etcd_addrs
     "10.106.250.244:2379,"

Related issue number

Fixes #1343

[siyuan0322]

The logic looks fine, but there should be a parameter in the Session for user to pass the addr.

[lidongze0629]

Thanks for submitting your pull request, it's a great job!

And I think there are still some work to be done before merged into main branch.

1. In addition to modifying the parts of k8s, the way launching session locally also needs to be changed. See detail from create etcd locally

2. And at the same time, you also need to update the code of client to ensure etcd_addrs can be passed to the coordinator, some useful info for you, such as session defination, launch coordinator from client

[wuyueandrew]

thanks, i'll fix these points

[lidongze0629]

LGTM.

[codecov-commenter]

Codecov Report

Merging #1359 (88bdd42) into main (5ea7c0d) will decrease coverage by 1.26%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #1359      +/-   ##
==========================================
- Coverage   73.56%   72.29%   -1.27%     
==========================================
  Files          88       88              
  Lines        9603     9609       +6     
==========================================
- Hits         7064     6947     -117     
- Misses       2539     2662     +123     

Impacted Files	Coverage Δ
python/graphscope/client/session.py	74.71% <ø> (ø)
python/graphscope/deploy/kubernetes/cluster.py	76.06% <50.00%> (-0.21%)	⬇️
python/graphscope/deploy/hosts/cluster.py	87.34% <66.66%> (-0.82%)	⬇️
python/graphscope/config.py	100.00% <100.00%> (ø)
python/graphscope/tests/unittest/test_java_app.py	55.00% <0.00%> (-45.00%)	⬇️
python/graphscope/analytical/app/java_app.py	24.24% <0.00%> (-44.95%)	⬇️
python/graphscope/framework/utils.py	64.56% <0.00%> (-1.05%)	⬇️
python/graphscope/framework/app.py	89.44% <0.00%> (-0.51%)	⬇️

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