Array converter fix

[luhmirin-s]

• Changed the AuxData to use IntArray directly to avoid confusion around conversions
• Changed the encoding logic to expect a byte stream of float array
• Added the computation tests to ensure that all parts work correctly together
• Also used the opportunity to align the API levels and tooling versions with SID

[Thinkorswim]

Looks good to me!
Do we need to make any changes in the readme?

[luhmirin-s]

Looks good to me! Do we need to make any changes in the readme?

I did not find any references to the methods in the readme file. JavaDoc comments are very explicit on the contents of the byte arrays, which should be sufficient, IMO.