Avoid long type autoboxing to Long in TxnID

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/pulsar/issues) and found nothing similar.


### Motivation

TxnID use Object.equals which is unnessary. should change to == 

### Solution

_No response_

### Alternatives

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

- [X] I'm willing to submit a PR!