Clients may now optionally add clientId and clientVersion information
when starting the analysis server.
In addition, this CL adds an example of how to use this package
and updates the changelog, readme and pubspec.
Change-Id: I969a13a7d8379d6289fbbbc5f8d1b66315aa6a37
Reviewed-on: https://dart-review.googlesource.com/c/82165
Reviewed-by: Devon Carew <devoncarew@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>