Fix exceptions in debugger extension

[citizenmatt]

This PR handles a number of exceptions generated while evaluating extra data such as "Active Scene", "this.gameObject", "Scene Path" and so on.

• Catches exceptions thrown by evaluated code and recovers gracefully. Retrieves the messages of various expected exceptions and silently logs at verbose level. Unexpected exceptions are reported at error level, to allow reporting and fixing
• Silently logs EvaluatorAbortedException rather than log as error. This is a process control exception and shouldn't be logged. Fixes DEXP-570625
• Catches UnityException thrown when evaluating API calls at invalid moments, e.g. calling GetActiveScene in a MonoBehaviour constructor. This could break evaluation of an entire Unity Object. Exception is caught and silently logged at verbose. Fixes RIDER-60794 and RIDER-60795
• Catches MissingComponentException and silently logs. Thrown by "null" instances returned from GetComponent when there isn't a Component attached to the current GameObject. Fixes DEXP-585430
• Catches MissingReferenceException and silently logs. Thrown by calling APIs from destroyed objects. Fixes DEXP-534612
• Catches UnassignedReferenceException and silently logs. Thrown by "null" instance objects created for an unassigned serialised field. Fixes DEXP-558487
• Prevent exceptions when implicit evaluation is disabled. Unity extensions are evaluated even if implicit eval is disabled, as there is a separate setting to disable them. Fixes RIDER-60798
• Gracefully handle possible null references while retrieving "Scene Path". Fixes DEXP-561412
• Handle null reference when showing debugger display string details for mesh components. Fixes DEXP-577753