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Removes the first `count` occurrences of elements equal to `element` from the
list stored at `key`. The `count` argument influences the operation in the
following ways:
- `count > 0`: Remove elements equal to `element` moving from head to tail.
- `count < 0`: Remove elements equal to `element` moving from tail to head.
- `count = 0`: Remove all elements equal to `element`.
For example, `LREM list -2 "hello"` will remove the last two occurrences of
`"hello"` in the list stored at `list`.
Note that non-existing keys are treated like empty lists, so when `key` does not
exist, the command will always return `0`.
@return
@integer-reply: the number of removed elements.
@examples
```cli
RPUSH mylist "hello"
RPUSH mylist "hello"
RPUSH mylist "foo"
RPUSH mylist "hello"
LREM mylist -2 "hello"
LRANGE mylist 0 -1
```
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