* Create AsyncExpression as a mirror of the synchronous Expression.

* Allow usage of toEventually with async expressions

Provide expecta to allow autoclosures with async expressions.
Provide expects to allow you to force synchronous expectations in Nimble

* Add AsyncExpression.swift to the xcodeproj

…erval (#1042)

* Replace public usage of DispatchTimeInterval with a new NimbleTimeInterval.

NimbleTimeInterval is effectively the same as DispatchTimeInterval, except that it conforms to Sendable, and there is no never case.
NimbleTimeInterval values are converted to DispatchTimeInterval values only when they actually need to be used with other Dispatch APIs.

* Update Sources/Nimble/Utils/NimbleTimeInterval.swift

Co-authored-by: IKEDA Sho <suicaicoca@gmail.com>

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Co-authored-by: IKEDA Sho <suicaicoca@gmail.com>

… the main actor (#1044)

This prevents a main thread checker error.

…e. (#1045)

* satisfyAllOf with toEventually should only evaluate the expression once each poll

Fixes #529

* Now apply that same behavior to satisfyAnyOf

* Rename AsyncDefaults to PollingDefaults

* Update documentation

…ncy (#1048)

Fixes #1049

* Be more careful about threading and notifications

Make sure that Nimble doesn't try to access notification properties from the main
thread as they may have been created on another thread and get upset
(most likely when Core Data is involved).
Fixes #973

* Fix typo in CONTRIBUTING.md file

* Update Tests/NimbleTests/Helpers/BackgroundThreadObject.swift

Co-authored-by: Rachel Brindle <you@subluminal.net>

* Fix tests for PostNotificationTest

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Co-authored-by: John McKerrell <john@mckerrell.net>

* Objective-C support in the Swift Package

SwiftPM objective-c translates some constant number types differently than xcode objective-c, for some reason?

* Add xcode 14.1 and 14.2 images to verify Nimble with

- Mention how to install via Swift Package Manager
- Directly mention that you need to await toEventually expectations in async contexts
- Rearrange the Polling Expectations section.