operation datastore abi functionalities

What's Changed

• Feature/as latest by @BatiGencho in #7
• fix ci by @qdrn in #9
• Op datastore abi 1 by @sydhds in #10
• Update derOpKeys to avoid memory weirdness by @sydhds in #11
• Prepare testnet 15 by @BatiGencho in #13

New Contributors

• @BatiGencho made their first contribution in #7
• @qdrn made their first contribution in #9
• @sydhds made their first contribution in #10

Full Changelog: https://github.com/massalabs/massa-as-sdk/commits/v1.1.0