Add Key Vault Keys

[RickWinter]

Create initial population of Key Vault Keys

[heaths]

@jhendrixMSFT has a PR that should be merged soon that'll fix this stuff.

[heaths]

The only thing blocking is that the main.rs file has to be removed or this creates an executable crate.

If you want to test things, I recommend either adding files under examples/ or tests/ (the latter, now that test-proxy work is at MVP).

You only do lib.rs+main.rs if you want to create an executable but with testable functions in lib.rs (you can't test functions in main.rs from outside that module itself).

[heaths]

@jhendrixMSFT the breaks are happening because of a bad enum name:

(RSAAESKEYWRAP_256, "RSA_AES_KEY_WRAP_256")

Given the "RSA_AES_KEY_WRAP_256" symbol, this should generate "RsaAesKeyWrap256". In Rust, type names (including variants) are PascalCase (what rustc calls "upper camelCase"...shudder) and members, variables, and parameters are snake_case.