feat(registry): contrib/registry/zookeeper add digest acl support

[youzhixiaomutou]

Description (what this PR does / why we need it):

The current registrar with zookeeper doesn't have any method for auth.
I think add a simple digest acl support is necessary.

Which issue(s) this PR fixes (resolves / be part of):

Other special notes for reviewer:

[codecov-commenter]

Codecov Report

Merging #1964 (cb460c2) into main (60465cc) will not change coverage.
The diff coverage is n/a.

❗ Current head cb460c2 differs from pull request most recent head 86b933b. Consider uploading reports for the commit 86b933b to get more accurate results

@@           Coverage Diff           @@
##             main    #1964   +/-   ##
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  Coverage   80.67%   80.67%           
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  Files          81       81           
  Lines        3618     3618           
=======================================
  Hits         2919     2919           
  Misses        492      492           
  Partials      207      207           

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[Cluas]

LGTM

[Cluas]

Thanks for the contribution!