Improve sanitizer approach

[surgupta-msft]

What problem would the feature you're requesting solve? Please describe.

We need to simplify the class Sanitizer.cs to improve performance. Currently it is using both regex approach and string comparison. We can optimize it to use either of these approaches. Note that the method Sanitize() gets executed a lot as it examines the logs and sanitizes any secret related strings. Also, using regex comparison is very expensive. For that we can use .Net feature GeneratedRegex for performance - link

Documentation here - Link