Add Parsed class for new-style YAML Metric

[theyostalservice]

Resolves #

Problem

Solution

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

[github-actions]

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[theyostalservice]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Add Parsed class for new-style YAML Metric #12161 👈 (View in Graphite)
• Add new-syle YAML unparsed metric #12157
• Stop allowing hyphens in metric names and add name validation tests #12158
• main

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[codecov]

Codecov Report

❌ Patch coverage is 86.25954% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.89%. Comparing base (f5cdb1d) to head (677d0b7).

Additional details and impacted files

@@                       Coverage Diff                        @@
##           patricky/add-new-metric-yaml   #12161      +/-   ##
================================================================
- Coverage                         91.96%   91.89%   -0.08%     
================================================================
  Files                               203      203              
  Lines                             24878    24957      +79     
================================================================
+ Hits                              22878    22933      +55     
- Misses                             2000     2024      +24     

Flag	Coverage Δ
integration	88.76% <82.44%> (-0.09%)	⬇️
unit	65.14% <33.58%> (-0.11%)	⬇️

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Components	Coverage Δ
Unit Tests	65.14% <33.58%> (-0.11%)	⬇️
Integration Tests	88.76% <82.44%> (-0.09%)	⬇️

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[github-actions]

Additional Artifact Review Required

Changes to artifact directory files requires at least 2 approvals from core team members.