Move code actions to LSP

Merge master to master-vs-deps

Merge master to master-vs-deps

Skip flaky test

RemotableDataService refactoring

Merge master to master-vs-deps

Remove trailing commas during conversion to class

Merge master to master-vs-deps

Related to #45296.

From specification:
If the record is derived from `object`, the record type includes a synthesized readonly property equivalent to a property declared as follows:
```C#
protected Type EqualityContract { get; };
```
The property is `virtual` unless the record type is `sealed`.
The property can be declared explicitly. It is an error if the explicit declaration does not match the expected signature or accessibility, or if the explicit declaration doesn't allow overiding it in a derived type and the record type is not `sealed`.

If the record type is derived from a base record type `Base`, the record type includes a synthesized readonly property equivalent to a property declared as follows:
```C#
protected override Type EqualityContract { get; };
```

The property can be declared explicitly. It is an error if the explicit declaration does not match the expected signature or accessibility, or if the explicit declaration doesn't allow overiding it in a derived type and the record type is not `sealed`. It is an error if either synthesized, or explicitly declared property doesn't override a property with this signature in the record type `Base` (for example, if the property is missing in the `Base`, or sealed, or not virtual, etc.).
The synthesized property returns `typeof(R)` where `R` is the record type.

AnalyzerDriver performance improvements

Update vs-threading analyzers to 16.7.53

Avoid exposing PrimaryWorkspace to LUT/SBD

Merge master to master-vs-deps

Features/static lambdas

* Standardize .NET Core / Standard references

This changes us to use standard references for our .NET Core and .NET
Standard unit test compilations.

The exception here is `netstandard1.3` usage which was not altered by this
change

Merge master to master-vs-deps

Fixes #45757

RQName cleanup

Fixes #45661
* Add test from contributor at #45742
Fixes #43834

Align addition of a synthesized record.Equals(record? other) in records with the latest design. (#45647)

Related to #45296.

From specification:
includes a synthesized strongly-typed overload of `Equals(R? other)` where `R` is the record type.
The method is `public`, and the method is `virtual` unless the record type is `sealed`.
The method can be declared explicitly. It is an error if the explicit declaration does not match the expected signature or accessibility, or the explicit declaration doesn't allow overriding it in a derived type and the record type is not `sealed`.
```C#
public virtual bool Equals(R? other);
```

Update Roslyn.Services.UnitTests.Utilities to target netcoreapp3.1

Co-authored-by: NCyrusNajmabadi <cyrus.najmabadi@gmail.com>