changelog for v1

[tac0turtle]

Summary by CodeRabbit

New Features:

• Introduced SaveChangeSet API for saving changesets as new versions.
• Added NewCompressExporter and NewCompressImporter APIs for compact snapshot formats.
• Enhanced Genesis writes speed by writing in small batches.
• Made KVPair and ChangeSet serializable with protobuf.

Bug Fixes:

• Fixed memory leaks and concurrent writes issues.

Refactor:

• Updated BatchWithFlusher struct for better batch size management.
• Modified NewMutableTree and NewImmutableTree functions for more flexible configuration.
• Improved Importer struct for better batch commit tracking.

Tests:

• Enhanced benchmarking capabilities with BenchmarkImportBatch function.

Chores:

• Updated Makefile targets for better golangci-lint usage.
• Removed unused v0.21.x release details from README.

Breaking Changes:

• Logger now needs to be passed to NodeDB, MutableTree, and ImmutableTree.
• Removed certain functions and endpoints.

[coderabbitai]

Walkthrough

This update introduces significant changes to the cosmos/iavl package, including new APIs, performance improvements, and bug fixes. It also modifies the handling of backporting patches in .mergify.yaml and updates the Makefile and README.md. The codebase has been refactored for better concurrency and error handling, and several tests have been updated to reflect these changes.

Changes

File(s)	Summary
.mergify.yaml, README.md	Removed backporting block for v0.21.x branch and updated information about the v0.21.x release.
CHANGELOG.md	Documented improvements and bug fixes to the cosmos/iavl package, including new APIs, performance enhancements, and breaking changes.
Makefile	Updated golangci_lint_cmd and added golangci_version. Removed tools target and updated lint and lint-fix targets.
batch.go, batch_test.go	Modified BatchWithFlusher struct and updated related tests.
benchmarks/bench_test.go, export_test.go, proof_iavl_test.go, testutils_test.go, tree_random_test.go, tree_test.go	Updated function calls to NewMutableTree and removed NewMutableTreeWithOpts.
immutable_tree.go, mutable_tree.go, nodedb.go, options.go	Introduced optional parameters to NewImmutableTree and NewMutableTree. Updated Options struct and related functions.
import.go, import_test.go	Updated Importer struct for better batch commit handling and added new benchmark function.
iterator.go, iterator_test.go	Modified NewNodeIterator function and updated related tests.
migrate_test.go	Updated legacyVersion value in TestLegacyReferenceNode function.
nodedb_test.go	Updated function calls and added new test cases.
mutable_tree_test.go	Updated test functions and minor changes to test cases.
unsaved_fast_iterator.go	Updated UnsavedFastIterator struct and related functions for better concurrency and error handling.

Poem

As the leaves fall, so does the old code, 🍂🍁
Making way for the new, bold and gold. 💫
With each change, the project grows, 🌱
Like a rabbit hopping, on its toes. 🐇
Celebrate the season, celebrate the change, 🎉
In the world of code, nothing is strange. 💻
So here's to the updates, big and small, 🥂
To the cosmos/iavl package, standing tall. 🚀

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