Adjust visibility of codependent MutableRepo and CommitBuilder functions #3193
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MutableRepo and CommitBuilder both define public (now crate-public) functions which should only be called by each other. This commit adds documentation and restricts visibility of these functions to the jj_lib crate. It might be even better to move CommitBuilder to the same module as MutableRepo so that these co-dependent functions can be private to the module to avoid misuse.