Refactor topology.ts into smaller source files

[caisq]

DEV

• Split Container and related classes, interfaces and functions into container.ts.
• Split InputLayer and related classes, interfaces and functions into input_layer.ts.

Towards tensorflow/tfjs#490

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This change is 

[davidsoergel]

Nice :) Aside: now that we're continuing down the road of abandoning parity with the Keras file organization, there are various other refactorings like this that would improve matters (imho) if anyone has the time.

Reviewable status: complete! 1 of 1 LGTMs obtained

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src/engine/container.ts, line 724 at r1 (raw file):

nit: extra newlines

[caisq]

Thanks for the review.

I forgot mention that this change actually improves parity with keras' source file structure, because keras underwent similar refactoring recently. But in general, I support refactoring to improve code structure.

Reviewable status: complete! 1 of 1 LGTMs obtained

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src/engine/container.ts, line 724 at r1 (raw file):

Previously, davidsoergel (David Soergel) wrote…

nit: extra newlines

Done.