Use manifest/2.0, resolved/2.0 for file format, add version bump enforcement

[lmolkova]

Patch version is removed from manifest and resolved file format.

This change follows a pattern used in configuration https://github.com/open-telemetry/opentelemetry-configuration/blob/main/VERSIONING.md#file-format and a TC call discussion in open-telemetry/opentelemetry-specification#4815 (comment)

The spec will need to include a language explaining that consumer that supports vN.M may warn but should read schemas of vN.P (P > M) and ignore unknown properties. Consumer that only supports vN.* should not attempt to read vM.*.

Added checks to validate that removing fields requires major version bump and adding fields requires minor version bump.

Will address forward-compat issues in a follow ups

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.7%. Comparing base (bcfb76f) to head (723250d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1333     +/-   ##
=======================================
- Coverage   81.7%   81.7%   -0.1%     
=======================================
  Files        113     113             
  Lines       9718    9718             
=======================================
- Hits        7942    7940      -2     
- Misses      1776    1778      +2     

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[jsuereth]

Agree with this path forward