Serializing a transaction with *signatures* no longer serializes the signatures

[mehcode]

Description

https://github.com/hiero-ledger/hiero-sdk-rust/pull/966/files#diff-ae5a8740a95234e0439aa9312af40e9a7520b1566fd4139262d47f3f61f17990R529-R530

Notice how to_bytes always builds a fresh transaction list and doesn't refer to signed sources anymore.

Is there another method that can be used to serialize a transaction with signatures?

Steps to reproduce

1. Create a transaction
2. Sign the transaction
3. Serialize the transaction
4. Deserialize the transaction
5. Notice the transaction is no longer signed

Additional context

No response

Hedera network

No response

Version

v0.38

Operating system

None

[gsstoykov]

@venilinvasilev Has started work on this!

[gsstoykov]

Resolved by @venilinvasilev will be included in next rel.