THRIFT-5653: UUID should use value 16 in Swift binary protocol

[kinoroy]

Removes non-standard utf8 type with raw value 16 and replaces uuid raw value with 16.
Brings Swift in compliance with spec:

thrift/doc/specs/thrift-binary-protocol.md

Line 204 in 0223d63

* `UUID`, encoded as `16`

This is technically a breaking change by removing the utf8 type, however this type was non-standard and not documented in the spec.

This causes new failing crosstests with Swift-Java with the binary protocol due to Java not yet being updated to match the spec.

• Did you create an Apache Jira ticket? (not required for trivial changes)
• If a ticket exists: Does your pull request title follow the pattern "THRIFT-NNNN: describe my issue"?
• Did you squash your changes to a single commit? (not required, but preferred)
• Did you do your best to avoid breaking changes? If one was needed, did you label the Jira ticket with "Breaking-Change"?
• If your change does not involve any code, include [skip ci] anywhere in the commit message to free up build resources.

[fishy]

Thank you for doing this!

(the following can be fixed in new PR(s) instead) travis has been failing with this swift error:

/thrift/src/lib/swift/Sources/TSocketServer.swift:83:60: error: type 'CFSocketError' (aka 'Int') has no member 'success'
      if CFSocketSetAddress(sock, cfaddr) != CFSocketError.success { //kCFSocketSuccess {
                                             ~~~~~~~~~~~~~ ^~~~~~~

since it looks like you are familiar with swift (😅), do you mind taking a look at that?

[kinoroy]

@fishy yes I can look at that, the reason is that Swift on Linux is not as stable as it is on macOS yet, they sometimes make breaking updates to the foundation library on Linux. I will look to see if we can standardize the version of Swift we use across Travis and Github actions.
Edit: tracking in https://issues.apache.org/jira/browse/THRIFT-5657