We have chosen a new name for this package. So before we write more
code inside, we need to move everything from 'server_plugin' to
'analysis_server_plugin'. There are some steps do doing so, to not
break various infra:
1. Land this change, introducing the new package in the SDK, but no
dependencies on it.
2. Land this change independently in google3 (the package is not
yet "unbundled.")
3. Mark the package as "unbundled" in google3.
4. Move all code from server_plugin to analysis_server_plugin; update
imports; and delete server_plugin.
5. Remove server_plugin as an "unbundled" package; and remove
server_plugin from google3.
Bug: https://github.com/dart-lang/sdk/issues/53402
Change-Id: I70197fdf61dd5862c2220d8ed5dd0880a1593ead
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/363600
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Samuel Rawlins <srawlins@google.com>
Brian Wilkerson