Enable logging of informational telemetry for analyzers/fixers/refactorings executed during Ctrl + .

If user enables informational RoslynEventSource telemetry following the steps at https://aka.ms/reportPerf, we log the execution times for each analyzer/fixer/refactorings when computing the code fixes and refactorings to show in the light bulb. This will help us identify slow analyzers/fixers/refactorings that lead to UI delays with "Gathering suggestions" dialog.

Link to http://sourceroslyn.io

Performance fix in analyzer driver for CFG based analyzers

Re-use semantic model when attempting to compute suppress message att…

Remove shortcircuit of status query for commands with handlers.

Instead of intercepting QueryStatus in AbstractOleCommandTarget we
will allow the request to bubble up for commands with command handlers.

Add nullable annotations to IDE code (part 2)

Fix SourceText.GetChanges exception on merging certain changes

ProjectExternalErrorReporter: Avoid subscribing to solution build events multiple times and leaking the object (#39389)

* Add FSharpProjectExternalErrorReporterFactory

* ProjectExternalErrorReporter: Avoid subscribing to solution build events multiple times and leaking the object

* Update F# shim

Use lifted operator in generated Equals if the underlying type's operator would have been used

* async -> asynchronous
* Fix up error messages for await using declarations in langver < 8.0
* Use CSharpTestBase.IAsyncDisposableDefinition for interfaces

We expose public APIs on IOperation related analysis contexts to fetch ControlFlowGraph for the operation block. Additionally, the analyzer driver caches the CFGs for operation block (when first requested by some flow based analyzer) to allow sharing CFGs between flow based analyzers. However, we were holding onto these for the entire lifetime of the compilation. This change fixes that by removing the CFG entry once a particular operation block has been fully analyzed.

Fixes VSFeedback issue [#998181](https://dev.azure.com/devdiv/DevDiv/_workitems/edit/998181)

Currently implementation always creates a new semantic model for decoding local suppress message attributes (applied to each symbol). This change attempts to re-use the cached semantic models held by the analyzer driver to avoid rebinding cost.
Fixes VSFeedback issue [#973445](https://dev.azure.com/devdiv/DevDiv/_workitems/edit/973445)

* EnC: Compare document content before performing IO while stepping

* Feedback

Enable detection and addition of solution level .editorconfig as solu…

Use ConstructWithNullability in InferTypeInAwaitExpression since the inferred type may include nullable information (#39335)

The inferred type may include nullability information, and will fail to be recognized as a symbol without using the correct construct call.

Fixes #39333

Update src/VisualStudio/Core/Def/Implementation/ProjectSystem/AnalyzerConfigDocumentAsSolutionItemHandler.cs

Co-Authored-By: NJoey Robichaud <joseph.robichaud@microsoft.com>

* Do not wait for output writer thread to complete when aborting execution in IW

* Only join threads when testing