remove seed_ef and use ef for hnsw iterator

[zhengbuqian]

kind/improvement

issue: https://github.com/zilliztech/knowhere/issues/500

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[zhengbuqian]

kind/improvement

issue: #500

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.28%. Comparing base (3c46f4c) to head (f4078cf). Report is 71 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #599       +/-   ##
=========================================
+ Coverage      0   70.28%   +70.28%     
=========================================
  Files         0       67       +67     
  Lines         0     4718     +4718     
=========================================
+ Hits          0     3316     +3316     
- Misses        0     1402     +1402     

see 67 files with indirect coverage changes

[alwayslove2013]

/lgtm

[zhengbuqian]

kind/improvement

issue: https://github.com/zilliztech/knowhere/issues/500

[cydrain]

/kind improvement