Initializers for joining a sequence of predicates

[MatthewTurk247]

This pull request implements the initializers proposed in #1860.

Testing:

See PredicateTests/all() and PredicateTests/any().

[jmschonfeld]

@swift-ci please test

[jmschonfeld]

The build failures look to be caused by this change:

/__w/swift-foundation/swift-foundation/Sources/FoundationEssentials/Predicate/Predicate.swift:59:90: error: static method 'build_evaluate' requires the types 'PredicateExpressions.PredicateRegex' and 'Expression<repeat each Input, Bool>' be equivalent

[MatthewTurk247]

Type inference is not working as I was expecting. I’ll add explicit annotations.

[jmschonfeld]

@swift-ci please test

[MatthewTurk247]

Is there an issue with platform availability behind the failed method resolution? I’m starting to suspect that the build routine is not picking up symbols for PredicateExpressions.PredicateEvaluate.

[jmschonfeld]

Is there an issue with platform availability behind the failed method resolution? I’m starting to suspect that the build routine is not picking up symbols for PredicateExpressions.PredicateEvaluate.

Ah I think this error message has the key detail:

/__w/swift-foundation/swift-foundation/Sources/FoundationEssentials/Predicate/Predicate.swift:60:90: error: referencing static method 'build_evaluate' on 'PredicateExpressions.Value' requires that 'Predicate<repeat each Input>' conform to 'Decodable'

I had forgotten that Predicate's conformance to Codable is gated behind FOUNDATION_FRAMEWORK because of dependencies not available in swift-foundation. Since StandardPredicateExpression requires a Codable conformance that means that the PredicateEvaluate operator also isn't available outside of FOUNDATION_FRAMEWORK. For now, I think we'll need to put this new API behind FOUNDATION_FRAMEWORK and separately we can investigate finding a way to lift that restriction

[jmschonfeld]

@swift-ci please test