[Frontend, Tensorflow, Tensorflow2] Tensorflow frontend op refactor (a…

…pache#8179)

* Refactoring the ops from Tf1 frontend

Co-authored-by: Rohan Mukherjee <[email protected]>
Co-authored-by: David Huang <[email protected]>
Co-authored-by: Xingyu Zhou <[email protected]>
Co-authored-by: Srinidhi Goud <[email protected]>
Co-authored-by: Xiao <[email protected]>

* Resolving an import bug and refactor

Co-authored-by: Xingyu Zhou <[email protected]>
Co-authored-by: Rohan Mukherjee <[email protected]>
Co-authored-by: David Huang <[email protected]>
Co-authored-by: Srinidhi Goud <[email protected]>
Co-authored-by: Xiao <[email protected]>

* Tf2 frontend importing from common ops

* linting and unused imports fix

* Applying changes from commit id f4ec5fd

Author: Masahiro Masuda <[email protected]>

Co-authored-by: Masahiro Masuda <[email protected]>

* Minor linting

Co-authored-by: Rohan Mukherjee <[email protected]>
Co-authored-by: Xingyu Zhou <[email protected]>
Co-authored-by: David Huang <[email protected]>
Co-authored-by: Srinidhi Goud <[email protected]>
Co-authored-by: Xiao <[email protected]>

Co-authored-by: David Huang <[email protected]>
Co-authored-by: Xingyu Zhou <[email protected]>
Co-authored-by: Srinidhi Goud <[email protected]>
Co-authored-by: Xiao <[email protected]>
Co-authored-by: Masahiro Masuda <[email protected]>