Conformance tests failing due to unimplemented system macros

[nirosys]

We currently have 31 conformance tests failing due to missing system macros:

PanicHookInfo { payload: Any { .. }, location: Location { file: \"src/lazy/expanded/e_expression.rs\", line: 143, col: 32 }, can_unwind: true, force_no_backtrace: false }

% cat conformance_test_failures_update_3.json | jq -r '.[] | [to_entries[] | .key as $key | .value[] | select(.result // "" | . != "Ok") | {path: $key, error: .error}] | [.[] | select(.error | contains("e_expression.rs\", line: 143"))][].path' | sort | uniq -c
   3 ./ion-tests/conformance/system_macros/delta.ion
   5 ./ion-tests/conformance/system_macros/make_decimal.ion
  11 ./ion-tests/conformance/system_macros/make_timestamp.ion
   4 ./ion-tests/conformance/system_macros/parse_ion.ion
   4 ./ion-tests/conformance/system_macros/repeat.ion
   4 ./ion-tests/conformance/system_macros/sum.ion

System Macros ToDo

• sum - Implement sum system macro #980
• repeat - Implement repeat system macro. #979
• delta - Implement delta system macro. #981
• make_decimal - Implement system macro make_decimal #986
• make_timestamp - Implement system macro make_timestamp #988
• make_blob
• parse_ion