chore: introduce nightly
feature flag to provide error backtrace
#1340
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What changes are included in this PR?
In nightly toolchain, there's an unstable feature
error_generic_member_access
which allows accessing the error to extract additional information. A common convention is toprovide
error backtrace here.This PR introduces a new non-default feature named
nightly
toiceberg
crate. When it's enabled, we will provide the backtrace if it's captured iniceberg::Error
.Are these changes tested?