chore: purge cache on reset

[rustatian]

Reason for This PR

ref: https://github.com/temporalio/roadrunner-temporal/issues/223

Description of Changes

• Purge sticky cache on full reset.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing.
• [x] Any required documentation changes (code and docs) are included in this PR.
• [x] Any user-facing changes are mentioned in CHANGELOG.md.
• [x] All added/changed functionality is tested.

[codecov-commenter]

Codecov Report

Merging #229 (83ab350) into master (17ec9f6) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master    #229      +/-   ##
=========================================
- Coverage    3.70%   3.70%   -0.01%     
=========================================
  Files          15      15              
  Lines        1296    1297       +1     
=========================================
  Hits           48      48              
- Misses       1246    1247       +1     
  Partials        2       2              

Impacted Files	Coverage Δ
plugin.go	0.00% <0.00%> (ø)

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