Minor Refactor: Update Transaction ordering in `SignatureUtils` to be alphabetical

[sappenin]

Currently, transactions here and here are randomly ordered.

[LukasDEDD]

Hi, I would like to work on this issue.
Could you please assign it to me?

[sappenin]

Sounds great, assigned!

[LukasDEDD]

Thank you

[LukasDEDD]

Hi! My PR for this issue is now ready. I hope everything looks good, but if anything needs to be adjusted, I’m happy to update it.

This is my first real contribution to xrpl4j, so I really appreciate the opportunity.
If there are any other junior-friendly tasks I could help with, I’d be glad to take on another one.

Thanks!

[sappenin]

Hi @LukasDEDD, thanks for your PR. I just reviewed, it looks nearly there!

Also, for follow-up features, take a look at the good first issue tasks.

[LukasDEDD]

thank you for your cooperation, if everything is ok, I would like to work on another issue, I have the theory but I need practice on a real project