changelog

.changelog/unreleased/improvements/3006-refactor-shielded-sync.md

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+This PR refactors shielded sync to make the following improvements
+    * Allow fetching new masp txs and trial-decrypting notes to happen asynchronously
+    * Parallelize the trial-decryptions
+    * Modularize the logic so that we can mock parts of the algorithm for tests and to enable migration over to using a specila masp indexer
+    * Added test coverage
+    * Decouple nullifying notes and updating spent notes from the trial-decryption process
+    * Refactor the masp.rs module in the sdk into several smaller files and submodules
+
+[\#3006](https://github.com/anoma/namada/pull/3006)