Throw panic when calling dataset.readTransaction

[majin1102]

The calling stack:

thread '<unnamed>' panicked at src/transaction.rs:547:14:
not implemented
stack backtrace:
0: __rustc::rust_begin_unwind
1: core::panicking::panic_fmt
2: core::panicking::panic
3: lance_jni::transaction::convert_to_java_operation_inner
4: lance_jni::transaction::convert_to_java_transaction
5: _Java_org_lance_Dataset_nativeReadTransaction

note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace