Support publishing FailureDetail messages for crashes
Adds a startup flag, "--failure_detail_out", whose default value is
"${OUTPUT_BASE}/failure_detail.rawproto".
Adds a class similar to the existing class which supports writing an exit
code file to the output base. This new class supports writing a serialized
FailureDetail protobuf message to the "--failure_details_out" path.
When Bazel handles a crash via BugReport.handleCrash, the new class is
used to write a FailureDetail message describing the crash.
Adds a Crash category message type to failure_details.proto. Along with
a Code-style subcategory enum field, this message type specifies a
repeated Throwable field to describe the java.lang.Throwable responsible
for the crash, if any, and its chain of causes. This chain's length is
limited to a small number: 5, for now.
The number of stack trace elements described is limited to 1000 per
Throwable, for now.
There are still ways for Bazel to fail without reporting FailureDetail
via gRPC or through the BugReport.handleCrash methods, notably during
startup. Future changes will add support for emitting FailureDetail in
more places.
RELNOTES: None.
PiperOrigin-RevId: 305398847
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