Initial Idem Support

[vreutova]

Initial support for Idem IAC provider of Infracost.

To run the code in this branch, run these steps:

git clone https://github.com/vreutova/infracost-idem-support infracost-idem-support
cd infracost-idem-support
make build
./build/infracost breakdown --path examples/idem/idem_plan.json 🚀

Using Idem CLI state command in the test mode
idem state test2.sls --test --output=json > ./output.json

And after that pass output.json to infracost cli:
./build/infracost breakdown --path=./output.json

Closes #2459

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ vreutova
❌ kpraveenk

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