Surface warnings from Zeek linter #4883
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In addition to errors Zeek's parsing can also expose warning messages,
e.g., for the following code
```zeek
event http_stats(c: connection, stats: http_stats_rec) {
c$removal_hooks;
}
```
a warning is emitted
```
warning in /tmp/foo.zeek, line 2: expression value ignored (c$removal_hooks)
```
This patch adds parsing and propagation of these warning messages.
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In addition to errors Zeek's parsing can also expose warning messages, e.g., for the following code
a warning is emitted
This patch adds parsing and propagation of these warning messages.