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

…pache#8179)

* Refactoring the ops from Tf1 frontend

Co-authored-by: Rohan Mukherjee <mukrohan@amazon.com>
Co-authored-by: David Huang <davhuan@amazon.com>
Co-authored-by: Xingyu Zhou <zhoxingy@amazon.com>
Co-authored-by: Srinidhi Goud <srinidhi.goud29@gmail.com>
Co-authored-by: Xiao <weix@amazon.com>

* Resolving an import bug and refactor

Co-authored-by: Xingyu Zhou <zhoxingy@amazon.com>
Co-authored-by: Rohan Mukherjee <mukrohan@amazon.com>
Co-authored-by: David Huang <davhuan@amazon.com>
Co-authored-by: Srinidhi Goud <srinidhi.goud29@gmail.com>
Co-authored-by: Xiao <weix@amazon.com>

* Tf2 frontend importing from common ops

* linting and unused imports fix

* Applying changes from commit id f4ec5fd

Author: Masahiro Masuda <masahi129@gmail.com>

Co-authored-by: Masahiro Masuda <masahi129@gmail.com>

* Minor linting

Co-authored-by: Rohan Mukherjee <mukrohan@amazon.com>
Co-authored-by: Xingyu Zhou <zhoxingy@amazon.com>
Co-authored-by: David Huang <davhuan@amazon.com>
Co-authored-by: Srinidhi Goud <srinidhi.goud29@gmail.com>
Co-authored-by: Xiao <weix@amazon.com>

Co-authored-by: David Huang <davhuan@amazon.com>
Co-authored-by: Xingyu Zhou <zhoxingy@amazon.com>
Co-authored-by: Srinidhi Goud <srinidhi.goud29@gmail.com>
Co-authored-by: Xiao <weix@amazon.com>
Co-authored-by: Masahiro Masuda <masahi129@gmail.com>