feat: bucket pagination

[mbenabda]

Proposed Changes

Simliar to #616 for buckets:
Add buckets_api.find_buckets_iter to make usage of buckets pagination simpler

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• pytest tests completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[bednar]

@mbenabda, thank you very much for your PR. Before we can proceed with merging, there are a few requirements that need to be met:

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 95.65217% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.43%. Comparing base (73849e7) to head (15a7880).
Report is 9 commits behind head on master.

Files	Patch %	Lines
influxdb_client/client/_pages.py	95.12%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #658      +/-   ##
==========================================
+ Coverage   90.40%   90.43%   +0.02%     
==========================================
  Files          39       40       +1     
  Lines        3513     3524      +11     
==========================================
+ Hits         3176     3187      +11     
  Misses        337      337              

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[bednar]

Thanks again for your PR 👍

LGTM 🚀