Optimize Array and Data encoding for XPC

[r-fogash]

The problem:
Data swift type treats itself as an array of Int8. This leads to an issues with the current XPCEncoder / XPCDecoder:

• each byte from Data encoded / decoded individually, this takes a lot of time
• each Int8 is encoded into a larger data type which leads to larger size of the encoded data
  Same issues applies for Arrays.

One possible solution is to encode Data and Array types into xpc data (because Data and Array is a continuous memory, so we can try)

Implementation
XPCRawEncodable and XPCRawDecodable protocols were introduced.
Data and Array extends that protocol in order to implement the serealization into / from xpc data object

XPC encoders are updated

also, package version update to macOS 11