Add documentation about the cmake plugin alerting the user that cmake doesn't set release mode by default.
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Issue body
### What needs to get done
Add a note block to the [cmake plugin reference](https://canonical-craft-parts.readthedocs-hosted.com/en/latest/common/craft-parts/reference/plugins/cmake_plugin.html) calling out that it doesn't add any cmake parameters, so if the user wants to use release they should add `-DCMAKE_BUILD_TYPE`
### Why it needs to get done
@dariuszd21 brought up the fact that the default may be debug.
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