FileCreate/FileUpdate automatic chunking

[jbair06]

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👾 Description of the issue

When creating or updating a file using the FileCreateTransaction or FileUpdateTransaction, if the contents are too large for a single transaction, a FileAppendTransaction is required to be created in addition to the FileCreate/FileUpdate.

FileAppendTransaction, on the other hand, can handle a large content because it does chunking of that content internally. It would be good to have FileCreate and FileUpdate to have this same functionality. This would allow for a single transaction to create or update a file with a large content.

Solution

Refactor FileCreateTransaction and FileUpdateTransaction to share the new abstract FileTransaction which should include an append method to store additional transactions when the content exceeds 1024 kB. Refer to FileAppendTransaction for an example of how to chunk the content.

Implementation

1. Create a new abstraction ex. FileTransaction with append method (for new transactions).
2. Create a base struct FileTransactionBase that implements FileTransaction with setContents method to handle large files by creating multiple transactions.
3. Update FileCreateTransaction and FileUpdateTransaction to implement FileTransaction
4. Create tests to verify the new functionality (unit tests and integration tests)

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