go/vt/discovery: configurable logger

[maxenglander]

Description

Make the logger used by discovery component configurable.

Related Issue(s)

#7193

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

None.

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

Tests

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Documentation

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Backward compatibility

• Protobuf changes should be wire-compatible.
• Changes to _vt tables and RPCs need to be backward compatible.
• RPC changes should be compatible with vitess-operator
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• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

Attention: Patch coverage is 68.33333% with 19 lines in your changes missing coverage. Please review.

Project coverage is 67.46%. Comparing base (ef84b32) to head (110f3b8).

Files with missing lines	Patch %	Lines
go/vt/discovery/options.go	40.00%	12 Missing ⚠️
go/vt/discovery/healthcheck.go	81.81%	4 Missing ⚠️
go/vt/discovery/topology_watcher.go	80.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17846      +/-   ##
==========================================
+ Coverage   67.44%   67.46%   +0.02%     
==========================================
  Files        1592     1593       +1     
  Lines      258209   258242      +33     
==========================================
+ Hits       174146   174235      +89     
+ Misses      84063    84007      -56     

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[deepthi]

go style is that you don't prefix the struct name with the package name.