[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 91.68%. Comparing base (8658c56) to head (b5771e0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13885   +/-   ##
=======================================
  Coverage   91.67%   91.68%           
=======================================
  Files         652      652           
  Lines       42506    42506           
=======================================
+ Hits        38968    38972    +4     
+ Misses       2731     2728    -3     
+ Partials      807      806    -1     

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