Add package tests for FoundationEssentials, FoundationInternationalization, and FoundationMacros (#149)

* Add package tests for FoundationEssentials, FoundationInternationalization, and FoundationMacros

* Fix i18n package test

Author: jmschonfeld

test-foundation-package/test-foundation-essentials.swift

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+import FoundationEssentials
+
+let data = Data([1, 2, 3])
+print(data)

test-foundation-package/test-foundation-essentials.txt

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+REQUIRES: platform=Linux
+RUN: rm -rf %t
+RUN: mkdir -p %t
+RUN: %{swiftc}  -o %t/test-foundation-essentials %S/test-foundation-essentials.swift
+RUN: %t/test-foundation-essentials | %{FileCheck} %s
+CHECK: bytes
+LLD-NOT: libFoundation.so
+LLD-NOT: libFoundationInternationalization.so

test-foundation-package/test-foundation-internationalization.swift

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+import FoundationInternationalization
+
+let style = IntegerFormatStyle<Int>()
+print(style)

test-foundation-package/test-foundation-internationalization.txt

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+REQUIRES: platform=Linux
+RUN: rm -rf %t
+RUN: mkdir -p %t
+RUN: %{swiftc}  -o %t/test-foundation-internationalization %S/test-foundation-internationalization.swift
+RUN: %t/test-foundation-internationalization | %{FileCheck} %s
+CHECK: IntegerFormatStyle
+LLD-NOT: libFoundation.so

test-foundation-package/test-foundation-macros.swift

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+import FoundationEssentials
+
+#if canImport(FoundationMacros)
+#error("Should not be able to import the FoundationMacros module directly")
+#endif
+
+let predicate = #Predicate<Int> {
+	$0 > 2
+}
+print(predicate)

test-foundation-package/test-foundation-macros.txt

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+REQUIRES: platform=Linux
+RUN: rm -rf %t
+RUN: mkdir -p %t
+RUN: %{swiftc}  -o %t/test-foundation-macros %S/test-foundation-macros.swift
+RUN: %t/test-foundation-macros | %{FileCheck} %s
+CHECK: Predicate
+LLD-NOT: libFoundationMacros.so
+LLD-NOT: libFoundation.so