[MNT] Update tensorflow and refactor networks

[MatthewMiddlehurst]

Fixes #2864

Updates the tensorflow version bound and refactors the networks module into subcategories. Updates the network config and testing to make a bit more sense, previously the config was not actually used where but tests?

Seems to have no failures. Maybe @hadifawaz1999 can comment on anything missing.

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[hadifawaz1999]

all networks seem to override python version in the config

[MatthewMiddlehurst]

always good fun checking out networks. I am pretty sure the _config dictionary does not do anything? Trying out some larger changes.