Improve the chunk size of FileAppend transaction.

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👾 Description of the issue

We can improve the default chunk size of 4096 bytes of the FileAppend transaction.

Solution

Create a FileAppend transaction
Add the maximum signatures allowed by the network (50)
Play and observe to adjust the max default chunk size.

Best is to do that as an test and once the max size is found we will have the test even in future to always proof that size.

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hashgraph / hedera-sdk-js