Expose `fluid-turret` mandatory properties as read-only in LuaEntityPrototype

[Muppet9010]

At present there isn't a way via the API to check on the amount of fluid needed in a fluid-turret for it to activate. I wanted to do this as a check during an RCON command by Streamers to create and fill up fluid-turrets. To alert them if they were putting in less fluid than the turret required to activate.

This would require exposing the

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fluid_buffer_size

and

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activation_buffer_ratio

properties of a fluid-turret as read only in LuaEntityPrototype.
https://wiki.factorio.com/Prototype/Flu ... uffer_size

However, with these 2 being added there seems no reason not to also add the other mandatory property that may be wanted via runtime API;

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fluid_buffer_input_flow

as another read only field on LuaEntityPrototype.