<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue. Ex. Adding a feature - Explain what this achieves.--> #### Description <!-- Issue number if applicable --> Adds new `configoptional` module. I left `GetOrInsertDefault` out of this first PR so we can get agreement on the basics first. #### Link to tracking issue Fixes #12981 Fixes #10266 <!--Describe what testing was performed and which tests were added.--> #### Testing <!--Describe the documentation added.--> See #13018 for usage and testing of the package on `confighttp` and `otlpreceiver`.  | 
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