[message-buffer 13/x] Rust Integration Tests (#794)

* test(message-buffer): add rust integration tests

add rust-toolchain.toml to pin rust version, add integration tests, update cpi caller auth seeds

* refactor(message-buffer): remove unused test ix

* chore(message-buffer): clean up

* refactor(message-buffer): simple refactor

* test(message-buffer): refactor integration test structure

* refactor(message-buffer): rename

* fix(message-buffer): fix min size check when shrinking msg buffer

* chore(message-buffer): cleanup

* fix(message-buffer): resize borrow bug fix

* test(message-buffer): refactor test util methods into MessageBufferTestContext for less duplication

* test(message-buffer): resolve merge conflicts from repo restructure

* chore(message-buffer): delete commented out code

Author: swimricky

.pre-commit-config.yaml

@@ -75,7 +75,7 @@ repos:
       - id: cargo-clippy-message-buffer
         name: Cargo clippy for message buffer contract
         language: "rust"
-        entry: cargo +nightly clippy --manifest-path ./pythnet/message_buffer/Cargo.toml --tests --fix --allow-dirty --allow-staged -- -D warnings
+        entry: cargo +nightly clippy --manifest-path ./pythnet/message_buffer/Cargo.toml --tests --fix --allow-dirty --allow-staged --features test-bpf -- -D warnings
         pass_filenames: false
         files: message_buffer
       # Hooks for solana receiver contract