Sometimes we need to dynamically remove a where clause referencing a particular column
and somtimes, only when the clause involves a particular operator.

Can be used as

Remove all clasues referencing column_a
```python3
query.remove_where('column_a')
```

Remove all clasues referencing column_a with operator `!=`
```python3
query.remove_where('column_a', '!=')
```

Store the bindings for each `where` on the where dict within self.wheres
so that we can easily remove the clause and it's bindings.