Emitting diagnostic event containing Soroban resource utilization metrics #3847
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Description
Resolves ##3759
This PR adds a few metrics to inform on network utilization and help answer the question "how close we are to the limits".
It adds the the metrics as diagnostic events, so that they can be consumed by the downstream.
It also adds a new "invoke time" metric which is a better comparison to the cpu instructions than the current "exec time", resolving #3776 (comment)
Checklist
clang-format
v8.0.0 (viamake format
or the Visual Studio extension)