[sdk] Move JS sdks into this repo

[jayantk]

This PR moves the contents of https://github.com/pyth-network/pyth-js into this repository. I did the following:

• Moved most of target_chains/ethereum/ to target_chains/ethereum/contracts to match the organization of aptos etc. exception is the examples folder which stayed in ethereum/examples
• Copied each javascript sdk from pyth-js to chain_name/js_sdk
• Copied the price pusher to the top-level price_pusher directory. (I think we will probably generalize this to support more chains, so top level made sense)

I have tried to keep this to moving/copying files, so I haven't changed any dependencies, package.jsons, or docs beyond what was necessary to get ci to pass. I will follow this up with a PR fixing all of that, plus the build & release process for the js libraries.

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[ali-behjati]

Thank you very much. I ran tilt locally to make sure it works and it worked.

I think the next steps are adding the new packages to lerna, having publish action for them and image push action for the price pusher.

[jayantk]

tested with tilt locally.