stake-pool: Remove mpl crate dependency for 1.16 upgrade #4588
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Problem
Because of circular dependencies between SPL and Metaplex Token Metadata, the SPL can't upgrade to Solana 1.16.
Solution
After trying many different options, nothing can be done directly at the source level, except for splitting out stake pools into their own repo.
This goes one of the lazy routes, and directly inlines the bits needed for metadata support in the stake pool program. If this looks ok, I'll do the same for single pools.
While implementing this, I first did just the program to make sure that everything worked exactly the same from the outside, and then I removed the mpl dependency from the tests.