* accesibility -> accessibility

* Acess -> Access

* actua -> actual

* agnotic -> agnostic

* aks -> ask

* Algoritm -> Algorithm

* alphabeitcally -> alphabetically

* Analayzer -> Analyzer

* analyer -> analyzer

* anlysis -> analysis

this will help us track some ratio such as completion commit/dismiss

This is being consumed via InternalsVisibleTo, so we can't delete it for
now.

The target framework netcoreapp2.0 includes a new type: `KeyValuePair`.
This conflicts with our `KeyValuePair` utility class and causes a lot of
friction whenever netcoreapp2.0 is added as a target framework for a
project.

Renaming the type to `KeyValuePairUtil` to remove the ambiguity.

Closes #27195

Fixes #27038

Failed TypeScript build:

https://devdiv.visualstudio.com/DevDiv/_git/VS/pullrequest/126057?_a=overview

This change exposes two SymbolFinder APIs to locate source declarations using the Roslyn
pattern-matcher logic.

This synchronization context is used by MD's test suite - it is
based on the idea that the IDE is not yet initialized so headless
tests can run, so it just routes the main synchronization context
calls into the native OS' main thread implementation

Closes #20907

Fixes #18121
Fixes #23336
Closes #24248

Related to #20907

Followup to #26325 and #26330. This PR updates the IDE to forward certain helpers to these more efficient implementations.

This helps things out by more quickly being able to determine if a type even contains a member with name, and thus whether or not it should even be hydrated into a symbol and have its members created. Previous we would have to do a linear scan on all the members in a type to determine this. Now this data is in a set which can be queried much more efficiently.

Fixes #26972

Also add
- CommonConversion.IsImplicit
- Compilation.HasImplicitConversion
Fixes #9461

We had lots of places doing GetTextAsync() and then blocking, which is
an anti-pattern if we can avoid it. Awhile back we plumbed the ability
to get syntax trees synchronusly in certain places, and so we had
the plumbing to do this. We just never did it.

I suspect "most cases" this was fine because the GetTextAsync was
operating on open files which isn't an issue. But there were a few
places that looked suspicious and it's easier to just do a batch
refactoring.

Move Unshipped public APIs to Shipped