ContractCreateFlow creates a file for smaller initcode

[0xivanov]

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