BUG: catch overflow in timestamp + offset operations
xref https://github.com/statsmodels/statsmodels/issues/3374

## [Current coverage](https://codecov.io/gh/pandas-dev/pandas/pull/15126?src=pr) is 85.53% (diff: 100%)
> Merging [#15126](https://codecov.io/gh/pandas-dev/pandas/pull/15126?src=pr) into [master](https://codecov.io/gh/pandas-dev/pandas/branch/master?src=pr) will increase coverage by **<.01%**

```diff
@@             master     #15126   diff @@
==========================================
  Files           145        145          
  Lines         51274      51281     +7   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits          43856      43865     +9   
+ Misses         7418       7416     -2   
  Partials          0          0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last update [e6a3c35...923eaa2](https://codecov.io/gh/pandas-dev/pandas/compare/e6a3c35d862d0b84366dbcb9fb28efa4b1251eac...923eaa2566a15f880a7dd3a70073a2cc06484405?src=pr)