* azure sas token detector implementation
* regex optimization and some refactoring of code.
* fixed breaking changes.
* change regex to support allowed Ip address
* remove stdout printing statements.
used background context for individual test.
* implemented CustomFalsePositiveChecker for Azure SAS detector.
* raise verification error on restricted ip address
* cache and skip invalid hosts
* some refactoring
* fix spelling mistake
* added more positive and negative test cases
* add test inputs directly in tests instead of declaring separately