feat(core): make AmplifyOutputsData and all nested types public

[harsh62]

Issue: #4030

Summary

• Remove @_spi(InternalAmplifyConfiguration) from AmplifyOutputsData and all 20+ nested structs, enums, and type aliases
• Make all internal initializers public (AmplifyOutputsData, Auth, Geo, Storage, Storage.Bucket)
• Keep version as an internal implementation detail — the public init defaults to the current supported schema version
• Update ~50 import statements across source and test files to remove SPI annotations
• Add 14 unit tests verifying the public API works without SPI imports

Customers can now programmatically construct and inspect configuration using just import Amplify:

import Amplify

let config = AmplifyOutputsData(
    auth: .init(
        awsRegion: "us-east-1",
        userPoolId: "us-east-1_abc",
        userPoolClientId: "client123"
    ),
    storage: .init(
        awsRegion: "us-east-1",
        bucketName: "my-bucket"
    )
)
try Amplify.configure(config)

// Inspect resolved configuration
let outputs = try AmplifyOutputs.amplifyOutputs.resolveConfiguration()
print(outputs.auth?.userPoolId)
print(outputs.storage?.bucketName)

Test plan

• 14 new public API tests pass (AmplifyOutputsDataPublicAPITests)
• 289 core Amplify tests pass
• 2761 plugin tests pass (0 failures from this change)
• swift build passes
• swiftformat --lint passes (0 files need formatting)

[codecov]

Codecov Report

❌ Patch coverage is 98.21429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 66.71%. Comparing base (9a91027) to head (d35a38d).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...mplify/Core/Configuration/AmplifyOutputsData.swift	98.21%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4190      +/-   ##
==========================================
- Coverage   66.74%   66.71%   -0.04%     
==========================================
  Files        1150     1150              
  Lines       43617    43672      +55     
==========================================
+ Hits        29113    29135      +22     
- Misses      14504    14537      +33     

Flag	Coverage Δ
API_plugin_unit_test	68.39% <ø> (-0.03%)	⬇️
AWSPluginsCore	68.07% <ø> (ø)
Amplify	47.55% <98.21%> (+0.74%)	⬆️
Amplify_Foundation_Bridge_unit_test	62.28% <ø> (ø)
Amplify_Foundation_unit_test	67.64% <ø> (ø)
Analytics_plugin_unit_test	83.43% <ø> (ø)
Auth_plugin_unit_test	72.48% <ø> (+0.13%)	⬆️
DataStore_plugin_unit_test	81.72% <ø> (-1.01%)	⬇️
Firehose_plugin_unit_test	53.15% <ø> (ø)
Geo_plugin_unit_test	73.39% <ø> (ø)
Kinesis_plugin_unit_test	52.17% <ø> (ø)
Logging_plugin_unit_test	64.86% <ø> (ø)
Predictions_plugin_unit_test	33.89% <ø> (ø)
PushNotifications_plugin_unit_test	85.66% <ø> (ø)
RecordCache_unit_test	76.40% <ø> (ø)
Storage_plugin_unit_test	78.10% <ø> (ø)
unit_tests	66.71% <98.21%> (-0.04%)	⬇️

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[harsh62]

Addressed all review feedback in the latest commit:

version (line 25): It's already internal (no access modifier = internal in Swift). Used only for Codable JSON decoding. The public init defaults to currentVersion internally.

Public initializers: Added public inits to all nested structs: PasswordPolicy, OAuth, Analytics, AmazonPinpoint, DataCategory, Notifications, Geo.Maps, Geo.SearchIndices, Geo.GeofenceCollections, and AmazonLocationServiceConfig.

Tests with optional values: Added 5 new tests with fully populated optional values: testConstructAuthWithAllFields (now includes passwordPolicy + oauth), testConstructAnalyticsConfig, testConstructDataCategoryConfig, testConstructNotificationsConfig, testConstructGeoWithMapsAndIndices. Total: 18 public API tests.