Add SDK Data Files and Rust Library

[bhgomes]

TODO

• Finish parameter serialization in manta-rs to import the rest of the parameters here
• Add rust-phf for the AssetId compile-time hash map No longer needed.
• Add checksums
• Setup framework to download data (part of the signer, either the build or the execution)

[stechu]

@bhgomes Do you think we should put the sum check to CI? (Should be done in a new PR).

[bhgomes]

@bhgomes Do you think we should put the sum check to CI? (Should be done in a new PR).

I think we should make it part of this issue: #4. Generally we want to add some CI, yes.

[stechu]

@Kevingislason @tommyjk21 Let me know you guys' thoughts. Otherwise I am happy to merge it soon.