Add RegEx.Replace test and new test case with more variation

[srutzky]

1. Added ExtractNumbersRegEx_Replace() method since Regex.Replace() does not require a collection or a loop, so this might be more efficient than using Regex.Split().

2. Added test wrapper method to reference new ExtractNumbersRegEx_Replace() test method.

3. Added test cases (both 40 and 4000 character versions), derived from the following T-SQL:

   DECLARE @TestD NVARCHAR(4000) = REPLICATE(N'a', 400) + REPLICATE(N'1', 400) +
       REPLICATE(N'b', 400) + REPLICATE(N'2', 300) + REPLICATE(N'c', 400) +
       REPLICATE(N'3', 300) + REPLICATE(N'd', 400) + REPLICATE(N'4', 300) +
       REPLICATE(N'e', 400) + REPLICATE(N'5', 300) + REPLICATE(N'f', 400);
   SELECT @TestD;

   and:

   DECLARE @TestE NVARCHAR(40) = REPLICATE(N'a', 4) + REPLICATE(N'1', 4) +
       REPLICATE(N'b', 4) + REPLICATE(N'2', 3) + REPLICATE(N'c', 4) +
       REPLICATE(N'3', 3) + REPLICATE(N'd', 4) + REPLICATE(N'4', 3) +
       REPLICATE(N'e', 4) + REPLICATE(N'5', 3) + REPLICATE(N'f', 4);
   SELECT @TestE;

NOTE: Unfortunately, I have not had, nor will have, time to test these changes. But everything looks correct 😸 .

Take care,
Solomon...
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