[DEP] Rename `BaseDeepNetwork` and deprecate inheritance of `BaseObject`

[MatthewMiddlehurst]

todo

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I have added the following labels to this PR based on the title: [ $\color{#312315}{\textsf{deprecation}}$ ]. I have added the following labels to this PR based on the changes made: [ $\color{#379E11}{\textsf{networks}}$ ]. Feel free to change these if they do not properly represent the PR.

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