Bump analyzer_plugin to 0.12.0

Change-Id: I221e8eb959116b6a0c098ed0870f9d28a54e2196
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/396626
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Samuel Rawlins <[email protected]>

Author: srawlins

pkg/analyzer_plugin/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 0.12.0-dev
+## 0.12.0
 - Breaking changes to `DartFileEditBuilder`: `convertFunctionFromSyncToAsync`
   and `replaceTypeWithFuture`.
 - Breaking changes to all classes in `lib/protocol/protocol_common.dart` and
@@ -9,14 +9,24 @@
   provides a `name` instance getter). The instances of each enum are also now
   considered exhaustive (which may trigger new diagnostics on existing switch
   statements and switch expressions).
+- Support version `7.x` of the `analyzer` package.
+- Support change descriptions on SourceEdit.
+- New API in `DartFileEditBuilder`: `getIndent`, `insertCaseClauseAtEnd`,
+  `insertConstructor`, `insertField`, `insertGetter`, `insertMethod`,
+  `writeIndent`.
+- New API in `DartEditBuilder`: `writeFormalParameter` and
+  `writeFormalParameters`.
+- New experimental API in `DartEditBuilder`: `writeOverride2`,
+  `writeReference2`, `writeType2`, `writeTypeParameter2`, and
+  `writeTypeParameters2`.
 
 ## 0.11.3
 
-- Support version `6.x` of the `analyzer` package
+- Support version `6.x` of the `analyzer` package.
 
 ## 0.11.2
 
-- Support version `5.x` of the `analyzer` package
+- Support version `5.x` of the `analyzer` package.
 
 ## 0.11.1
 - Call `analyzeFiles` from `handleAffectedFiles` only for files that are
@@ -26,17 +36,17 @@
 - Using `AnalysisContextCollection` and `AnalysisContext` for analysis.
 
 ## 0.10.0
-- Support version `4.x` of the `analyzer` package
+- Support version `4.x` of the `analyzer` package.
 
 ## 0.9.0
-- Support version `3.x` of the `analyzer` package
+- Support version `3.x` of the `analyzer` package.
 
 ## 0.8.0
 - Require SDK `2.14` to use `Object.hash()`.
 - Require `yaml 3.1.0` to use `recover`.
 
 ## 0.7.0
-- Support version `2.x` of the `analyzer` package
+- Support version `2.x` of the `analyzer` package.
 
 ## 0.6.0
 - Bug fixes to the protocol.

pkg/analyzer_plugin/pubspec.yaml

@@ -1,6 +1,6 @@
 name: analyzer_plugin
 description: A framework and support code for building plugins for the analysis server.
-version: 0.12.0-dev
+version: 0.12.0
 repository: https://github.com/dart-lang/sdk/tree/main/pkg/analyzer_plugin
 
 environment: