feat: add sub-path support to mutator and retriever #12
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Add support for sub-paths (e.g. 'file.metaData.path'). Should not conflict with indexed paths e.g. 'person.addresses.0' or 'person.addresses.private'. The former has a numerical index and is thereby ignored, the latter is not as straightforward. When retrieving data we check if the index ('path') exists on the property ('metaData'). Indexed properties should always be non-associative array and thus there is no match. When setting data we can check the value. If the value is an associative array we must assume it's an indexed path and process it as such. Hence it is not possible to use an associative array as a value for a sub-path (but I don't think that's a common use case).
Fixes #2