removed API in service hub that internally play with data (options) in workspace rather than solution snapshot.

now, like other features, analyzer uses snapshot of options rather than mutable one from Workspace.

eventually we should only use OptionSet snapshot embeded in solution rather than one in workspace.

1. write logs as warning rather than error when connection is closed (basically operation cancelled)

2. build compilation concurrently for diagnostic analyzers.

implements IProjectCacheHostService in OOP.

fixed 2 issue where IDE analyzer throws null exception and host analyzer exception message not going away from error list issue.

fixed 2 issue where IDE analyzer throws null exception and host analyzer exception message not going away from error list issue.

workspace will cache everything in memory if this service doesn't exist in workspace. now this being exist, workspace will start to put things such as text, tree, compilation either kick out from memory or save it to temporary storage.

this should reduce memory foot print once things become idle, but this doesn't help memory footprint while feature is running.

with this service, once OOP become idle, memory foot print goes down to about 700MB to 1 GB. but still while code lens run, memory goes up to 3GB.

This reverts commit 720f5c5e, reversing
changes made to 6a6043c3.

changes include
make SourceText::GetChecksum and AnalyzerTelemetry contructor public.

added MustRunInProc in IBuiltInAnalyzer and some clean up around serializing Solution/Project/DocumentId and how DocumentState is exposed.

simplified temporary storage service's temporary storage management and added ability to attach to existing temporary storage

solution checksum and serialization service.

added remote host client
- this gives an ability for host (vs) to talk to remote host (service hub)

rename and moving files between feature/workspace layers
- only real change is having ICompilerDiagnosticAnalyzer interface which can either have inproc implementation or out of proc implementation.
- inproc is needed since diagnostics are in feature layer and one who uses feature layer out side of VS host need an implementation.

added RemoteWorkspace
- RemoteWorkspace has host agnostic implementation of roslyn features/services/workspace that will run in remote host

added service hub component and setup project for service hub
- service hub component is basically thin layer that deals with converting data to pass in to RemoteWorkspace

made devdiv insertion tool to ignore servicehub related files

support byte and char array natively in ObjectReader/Writer

RemoteWorkspace has host agnostic implementation of roslyn features/services/workspace that will run in remote host