Bor file structure updated

[anshalshukla]

POS-859

[anshalshukla]

The work is still in progress

[0xKrishna]

I will review it soon.

[enriavil1]

With so many changes it might be a good idea to start adding more bor specific tests. Because of the size of the chain it is difficult to test it, by running the chain

[0xKrishna]

@enriavil1 I have done the testing with the team, I think this PR is good to merge.
Once @anshalshukla resolves the merge conflict, Then after a final review we can merge this.
For reference we can always compare this with original bor repo.

We have to get this PR merged soon because we have some features in original bor repo which are pending on erigon side and they are dependent on this file structure change. So first we do this file structure change and then only we can start implementing those feature which are important from stability point of view.

[manav2401]

LGTM overall. Great work @anshalshukla 🚀

Have added few minor comments. Also, as discussed, let's undo remove all changes in metrics package. We'll add them in a different PR as discussed.

[manav2401]

LGTM