Improve helpers module

[isHarryh]

Summary

This PR does some minor improvements on the helpers module. These improvements will not affect the existing features.

Common Changes

1. Type hints.

Individual Changes

1. ArchiveStorageDecryptor: Uses an inline approach to replace the function to_uint4_array, which can improve the performance and simplify the code.
2. ResourceReader: Refactors the get_resource_data function, because this function used an implicit argument overloading trick (mixed the 4-args invocation and the 3-args invocation, but only 4-args invocation is used externally), which is bad for maintaining.
3. UnityVersion: Fixes the error in the method fromString.

[K0lb3]

TPKTYPETREE is always a TpkTypeTreeBlob due to the init call at the end of the file.
So the Optional would add more trouble, as the other functions here would then need unnecessary None checks.

[isHarryh]

I see.
I guess it would be better if we use something like TPKTYPETREE: TpkTypeTreeBlob = init(), which is also an execute-at-import behavior but result in more clear intention and better type checking experience which avoid separating the init() call to the end of the file.

[K0lb3]

Sadly that doesn't work, as the parser classes aren't defined yet at that point.
It simply errors.

Exception has occurred: NameError
name 'TpkFile' is not defined

[isHarryh]

According to your 4 reviews. I have changed these things and force-pushed these changes.

[isHarryh]

Okay. 2 fixes were applyed since the last push:

1. Revert the changes in Tpk.py which caused NameError.
2. Use forward reference "SerializedFile" in ResourceReader.