Rename Project Euler directories and other dependent changes (#3300)

* Rename all Project Euler directories:

Reason:
The change was done to maintain consistency throughout the directory
and to keep all directories in sorted order.

Due to the above change, some config files had to be modified:
'problem_22` -> `problem_022`

* Update scripts to pad zeroes in PE directories

project_euler/problem_007/sol3.py

@@ -0,0 +1,51 @@
+"""
+Project 7: https://projecteuler.net/problem=7
+
+By listing the first six prime numbers:
+
+    2, 3, 5, 7, 11, and 13
+
+We can see that the 6th prime is 13. What is the Nth prime number?
+"""
+import itertools
+import math
+
+
+def prime_check(number: int) -> bool:
+    """Determines whether a given number is prime or not"""
+    if number % 2 == 0 and number > 2:
+        return False
+    return all(number % i for i in range(3, int(math.sqrt(number)) + 1, 2))
+
+
+def prime_generator():
+    num = 2
+    while True:
+        if prime_check(num):
+            yield num
+        num += 1
+
+
+def solution(nth: int = 10001) -> int:
+    """Returns the n-th prime number.
+
+    >>> solution(6)
+    13
+    >>> solution(1)
+    2
+    >>> solution(3)
+    5
+    >>> solution(20)
+    71
+    >>> solution(50)
+    229
+    >>> solution(100)
+    541
+    >>> solution()
+    104743
+    """
+    return next(itertools.islice(prime_generator(), nth - 1, nth))
+
+
+if __name__ == "__main__":
+    print(solution(int(input().strip())))