* DeclareAsNullable on invocation with null

* Fix from assignment

* Use different equivalence key for null argument

* Recognize null assignments to fields and properties

* Address feedback from Cyrus

* Annotate nullability

If we fail to create the sqlite db, don't continually retry for every client that wants it.

Be more resilient to exceptions happening in sqlconnection.

Infer better variable names for a foreach expression.

Remove hidden extract method option.

Move UseCoalesceExpression analyzers/fixers/tests to shared layer

Co-Authored-By: NSam Harwell <sam@tunnelvisionlabs.com>

Restore explicit tests for IEnumerable<byte> and byte[]

Fix race in VBCSCompiler test

These tests call the same API, but provided value in clarity regarding
behavior in two known user scenarios.