Changelog for #3655

Co-authored-by: Tomas Zemanovic <[email protected]>

Author: sug0

.changelog/unreleased/improvements/3655-speed-up-ctx-build.md

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+- Speeds up client commands on networks with massive balances.toml
+  files. Previously, to retrieve the native token of some network,
+  we had to parse these giant files. Now, we only parse the
+  necessary genesis toml files required to retrieve the native token.
+  ([\#3655](https://github.com/anoma/namada/pull/3655))