feat(metrics): add incremental mode logic #9402
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Summary
Incremental mode isn't implemented yet in the cairo compiler, so this is disabled for now with an
error message. However, once implemented, the logic is already in place.
An example projects, perpetual, was added as a vendored copy, sans .git.
It includes a cairo-project stub, and patch files ready for compilation.
Note that this incremental logic was tested under a local scarb implementation, but currently it can
no longer be tested since we have no incremental compilation.
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