Just the upper-stream for
https://github.com/Snowfork/polkadot-sdk/pull/137

 and more context
there.

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Co-authored-by: Clara van Staden <[email protected]>
Co-authored-by: Adrian Catangiu <[email protected]>

Removes the `bridges/snowbridge/parachain` directory and moves
everything up to under `snowbridge` directly. We are cleaning up our
local dev env after merging our crates into the polkadot-sdk.

---------

Co-authored-by: claravanstaden <Cats 4 life!>