feat: add tracing feature

[marcuspang]

Description

Enables transaction durations to be trace-able, which is gated behind the tracing feature flag. This will be used to generate a time-series data for how long transactions take, as the cache increases in size, to illustrate the improvements in using cairo-native.

Currently the duration is stored with the transaction execution info, not sure if this is the best place to store it.

Changes

• added tracing feature to Cargo.toml
• added some unit tests to check whether the trace works

[rodrigo-pino]

Stale