Further fixes to make the code usuable in `librustzcash`#185

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vivek-arte wants to merge 2 commits intozsa1from

fixes_for_librustzcash

Commits on Sep 5, 2025

expanding visibility of encode and decode of IssueAuthSig to make it usable in librustzcash
vivek-arte
committed
changing from_data function to from_sig function to take advantage of the error handling in orchard
vivek-arte
committed