* Create output caching middleware

* Fix MVC attribute

* Update src/Middleware/OutputCaching/src/Policies/EnableCachingPolicy.cs

Co-authored-by: Kahbazi <A.Kahbazi@gmail.com>

* Update src/Middleware/OutputCaching/src/DispatcherExtensions.cs

Co-authored-by: Kahbazi <A.Kahbazi@gmail.com>

* Update src/Middleware/OutputCaching/src/Policies/PredicatePolicy.cs

Co-authored-by: Kahbazi <A.Kahbazi@gmail.com>

* Update src/Middleware/OutputCaching/src/Policies/ExpirationPolicy.cs

Co-authored-by: Kahbazi <A.Kahbazi@gmail.com>

* Fix mention of response cache

* Update src/Middleware/OutputCaching/src/OutputCachingPolicyProvider.cs

Co-authored-by: Kahbazi <A.Kahbazi@gmail.com>

* Use IReadOnlyList in IPoliciesMetadata

* Add XML documentation

* Missing changes

* Remove unused file

* PR feedback

* Fix build

* Add Path sample

* Fix build

* Update public api

* Fix typos

[skip ci]

* Update sample

[skip ci]

* Fix build

* API cleaning and test project

* Update src/Middleware/OutputCaching.Abstractions/src/Microsoft.AspNetCore.OutputCaching.Abstractions.csproj

Co-authored-by: James Newton-King <james@newtonking.com>

* Update src/Middleware/OutputCaching/src/Microsoft.AspNetCore.OutputCaching.csproj

Co-authored-by: James Newton-King <james@newtonking.com>

* Update TrimmableProjects

* Fix solution

* Improve ThrowIfNull usage

* API review feedback

* Add more tests

* Update API

* Clean up api

* Update unit tests

* Remove CachedResponseHeaders from public API

* Fix unshipped file

* API review feedback

* Fix unit tests

* Feedback

* Refactor resolved policies

* Clean sample

* Provide HttpContext in VaryByValue

* Reduce public API

* Apply API review changes

* Add more tests

* Add more tests

* Apply PR feedback

* PR feedback

* PR feedback

* Brennan's

* Update submodule (#42357)

Co-authored-by: Kahbazi <A.Kahbazi@gmail.com>
Co-authored-by: James Newton-King <james@newtonking.com>