Fix rounding drift by reading adapter's live share balance - #645

You have commit messages with errors ⧗ input: Fix rounding drift by reading adapter's live share balance Fixes #566, #556: The vault now correctly tracks ADPT_SH by reading the adapter's live share balance instead of estimating decrements. Added total_shares() to the YieldAdapterInterface to facilitate this. ✖ type may not be empty [type-empty] ✖ subject may not be empty [subject-empty] ✖ found 2 problems, 0 warnings ⓘ Get help: https://github.com/conventional-changelog/commitlint/#what-is-commitlint