Given an array of strings `strs`, group the anagrams together. You can return the answer in any order.

An Anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once.

Example 1:

    Input: strs = ["eat","tea","tan","ate","nat","bat"]
    Output: [["bat"],["nat","tan"],["ate","eat","tea"]]

Example 2:

    Input: strs = [""]
    Output: [[""]]

Example 3:

    Input: strs = ["a"]
    Output: [["a"]]

Constraints:

- `1 <= strs.length <= 104`
- `0 <= strs[i].length <= 100`
- `strs[i]` consists of lowercase English letters.