Update MobileNet Model

[SIDHARTH-7]

This PR is to update the Implementation of MobilenetV1 which was implemented in #72 and worked upon by @Aakash-kaushik , @zoq and @kartikdutt18 . The files are named just mobilenet so that we could include further versions in the same files for better readability.

[mlpack-bot]

Thanks for opening your first pull request in this repository! Someone will review it when they have a chance. In the mean time, please be sure that you've handled the following things, to make the review process quicker and easier:

• All code should follow the style guide
• Documentation added for any new functionality
• Tests added for any new functionality
• Tests that are added follow the testing guide
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• HISTORY.md updated if the changes are big or user-facing
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[SIDHARTH-7]

@shrit I will add some tests and then we could check the Implementation of Separable Convolution as well on my local machine.
Please check if my current Implementation can be Improved or if it is wrong.

[mlpack-bot]

This issue has been automatically marked as stale because it has not had any recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions! 👍

[mlpack-bot]

Thanks for opening your first pull request in this repository! Someone will review it when they have a chance. In the mean time, please be sure that you've handled the following things, to make the review process quicker and easier:

• All code should follow the style guide
• Documentation added for any new functionality
• Tests added for any new functionality
• Tests that are added follow the testing guide
• Headers and license information added to the top of any new code files
• HISTORY.md updated if the changes are big or user-facing
• All CI checks should be passing

Thank you again for your contributions! 👍