Refresh ATT&CK data to v7.2 and expand threat validation (#330)

* refresh to latest ATT&CK 7.2
* add new unit test to further validate threat mappings
* updated threat mappings in rules to reflect changes
* new func to download and refresh mitre data based on version

rules/linux/execution_python_tty_shell.toml

@@ -33,7 +33,7 @@ event.category:process and event.type:(start or process_started) and process.nam
 framework = "MITRE ATT&CK"
 [[rule.threat.technique]]
 id = "T1059"
-name = "Command-Line Interface"
+name = "Command and Scripting Interpreter"
 reference = "https://attack.mitre.org/techniques/T1059/"