`ContractCreateFlow` creates a file for smaller initcode

### Problem

The `ContractCreateFlow` does not take advantage of newer features of HAPI to reduce the number and cost of transactions. Same issue in all SDKs.

### Solution

* The initcode file is created unconditionally instead of directly using `ContractCreateTransaction.bytecode` if it fits within a single transaction. File append and delete would likewise not be needed if bytecode is populated.
* `FileCreateTransaction` partial bytecode is limited to 2048 instead of a larger size closer to max HAPI size 6 KiB
* `FileAppendTransaction` sets chunk size to 2048 instead of a size closer to max HAPI size 6 KiB

### Alternatives

_No response_