Improve exception handling information in ScanTarget

[ic0ns]

Description

There are two related TODOs in the ScanTarget class that need to be addressed:

1. Line 84: TODO: "in the current design we discard the exception info; maybe we want to keep this in the future"

2. Line 91: TODO: "similar to the unknownHostException, we do not keep any information as to why the target is blocklisted it may be nice to distinguish cases where the domain is blocked or where the IP is blocked"

Both TODOs involve improving how exception information is handled and stored, particularly for diagnostic purposes. We should enhance the implementation to retain more information about exceptions and blocklisting reasons.

References

• ScanTarget.java
• Related to: https://github.com/tls-attacker/TLS-Attacker-Development/issues/1318