pczt: Add public getter for spend_auth_sig#22

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maint/pczt-0.5.xvalargroup/librustzcash:maint/pczt-0.5.xfrom

roman/pczt-0.5.x/pub-spend_auth_sigvalargroup/librustzcash:roman/pczt-0.5.x/pub-spend_auth_sigCopy head branch name to clipboard