Extend Tensorflow support

[utsavgarg]

For Tensorflow, the import feature currently only supports a few layers (~10), we want to extend this to support as many layers as are available in our Keras backend (~60). Also, the current export for Tensorflow uses the Keras backend, we want to write a separate backend for Tensorflow export so that backends are not as highly coupled.

Deliverables

A basic setup that fulfils the following requirements:

• [ ] Adding support for the remaining layers in TF
• [ ] Testing the robustness of the import implementation for the existing layers
• [ ] Write unittests for TF backend

Please comment for if you have questions.

[Ram81]

@utsavgarg I would like to work on this one

[Shivanshmundra]

@Ram81 What is the progress on this issue, if not much I would like to take this issue.

[Ram81]

@Shivanshmundra sorry but I am working on this, please take up some other issue.

[Shivanshmundra]

Ok, I will look up for some another issue.