Removed deprecated code (#93)

### Motivation

Fixes #80.

In prep for 1.0, remove deprecated code we kept around for easier
migration between alphas.

### Modifications

Removed deprecated code.

### Result

Less code to maintain for the lifetime of 1.0.

### Test Plan

Updated tests.

Author: czechboy0

Sources/Configuration/Deprecations.swift

@@ -12,77 +12,4 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if JSONSupport
-/// A provider of configuration in JSON files.
-@available(Configuration 1.0, *)
-@available(*, deprecated, message: "Renamed to FileProvider<JSONSnapshot>")
-public typealias JSONProvider = FileProvider<JSONSnapshot>
-#endif
-
-#if YAMLSupport
-/// A provider of configuration in YAML files.
-@available(Configuration 1.0, *)
-@available(*, deprecated, message: "Renamed to FileProvider<YAMLSnapshot>")
-public typealias YAMLProvider = FileProvider<YAMLSnapshot>
-#endif
-
-#if ReloadingSupport
-
-#if JSONSupport
-/// A reloading provider of configuration in JSON files.
-@available(Configuration 1.0, *)
-@available(*, deprecated, message: "Renamed to ReloadingFileProvider<JSONSnapshot>")
-public typealias ReloadingJSONProvider = ReloadingFileProvider<JSONSnapshot>
-#endif
-
-#if YAMLSupport
-/// A reloading provider of configuration in JSON files.
-@available(Configuration 1.0, *)
-@available(*, deprecated, message: "Renamed to ReloadingFileProvider<YAMLSnapshot>")
-public typealias ReloadingYAMLProvider = ReloadingFileProvider<YAMLSnapshot>
-#endif
-
-#endif
-
-/// An immutable snapshot of a configuration provider's state.
-@available(Configuration 1.0, *)
-@available(*, deprecated, renamed: "ConfigSnapshot")
-public typealias ConfigSnapshotProtocol = ConfigSnapshot
-
-@available(Configuration 1.0, *)
-extension ConfigReader {
-    /// Provides a snapshot of the current configuration state and passes it to the provided closure.
-    ///
-    /// This method creates a snapshot of the current configuration state and passes it to the
-    /// provided closure. The snapshot reader provides read-only access to the configuration's state
-    /// at the time the method was called.
-    ///
-    /// ```swift
-    /// let result = config.withSnapshot { snapshot in
-    ///     // Use snapshot to read config values
-    ///     let cert = snapshot.string(forKey: "cert")
-    ///     let privateKey = snapshot.string(forKey: "privateKey")
-    ///     // Ensures that both values are coming from the same underlying snapshot and that a provider
-    ///     // didn't change its internal state between the two `string(...)` calls.
-    ///     return MyCert(cert: cert, privateKey: privateKey)
-    /// }
-    /// ```
-    ///
-    /// - Parameter body: A closure that takes a `ConfigSnapshotReader` and returns a value.
-    /// - Returns: The value returned by the closure.
-    /// - Throws: Rethrows any errors thrown by the provided closure.
-    @available(*, deprecated, message: "Renamed to snapshot().")
-    public func withSnapshot<Failure: Error, Return: ~Copyable>(
-        _ body: (ConfigSnapshotReader) throws(Failure) -> Return
-    ) throws(Failure) -> Return {
-        let multiSnapshot = provider.snapshot()
-        let snapshotReader = ConfigSnapshotReader(
-            keyPrefix: keyPrefix,
-            storage: .init(
-                snapshot: multiSnapshot,
-                accessReporter: accessReporter
-            )
-        )
-        return try body(snapshotReader)
-    }
-}
+// Put deprecated symbols here and they will be removed during the next API-break.

Tests/ConfigurationTests/Deprecations.swift

@@ -15,16 +15,7 @@
 import Configuration
 import SystemPackage
 
-/// This type only exists to test that deprecated symbols are still usable.
+/// Test that deprecated symbols are still usable.
 @available(Configuration 1.0, *)
 @available(*, deprecated)
-struct Deprecations {
-    #if ReloadingSupport && JSONSupport && YAMLSupport
-    func fileProviders() async throws {
-        let _ = try await JSONProvider(filePath: "/dev/null")
-        let _ = try await ReloadingJSONProvider(filePath: "/dev/null")
-        let _ = try await YAMLProvider(filePath: "/dev/null")
-        let _ = try await ReloadingYAMLProvider(filePath: "/dev/null")
-    }
-    #endif
-}
+struct Deprecations {}