[configoptional] Mark as 1.0

[mx-psi]

Description

Marks configoptional as 1.0.

Notably missing from configoptional is support for scalar values. This has been analyzed over at #13421 and the conclusion is that it can be done in a backwards compatible way.

cc @open-telemetry/collector-approvers

I intend to merge this on or after October 6th (but if, while I am away, this gets enough approvals, we can go ahead and merge it).

Link to tracking issue

Fixes #13403

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.66%. Comparing base (3484f81) to head (0dbd01e).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13885      +/-   ##
==========================================
- Coverage   91.67%   91.66%   -0.01%     
==========================================
  Files         652      652              
  Lines       42516    42516              
==========================================
- Hits        38978    38974       -4     
- Misses       2730     2733       +3     
- Partials      808      809       +1     

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