feat: Add Microsoft authentication

[harshithsudarsan]

Summary

• Add a ParseMicrosoft third-party auth adapter using the microsoft auth type.
• Support secure Microsoft auth data with code and redirect_uri, plus the legacy id and access_token shape for existing Parse Server compatibility.
• Add callback, async/await, and Combine APIs with matching unit test coverage.

Testing

• env CLANG_MODULE_CACHE_PATH=build/module-cache swift build
• env CLANG_MODULE_CACHE_PATH=build/module-cache swift test --filter ParseMicrosoft (blocked locally: this Command Line Tools-only environment cannot import XCTest; all test files fail before execution with no such module XCTest)

Closes #55

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f1d9e1fd-84f2-4ef9-b0eb-97a8d1b48654

📥 Commits

Reviewing files that changed from the base of the PR and between 645180e and c78f3d1.

📒 Files selected for processing (6)

• Sources/ParseSwift/Authentication/3rd Party/ParseMicrosoft/ParseMicrosoft+async.swift
• Sources/ParseSwift/Authentication/3rd Party/ParseMicrosoft/ParseMicrosoft+combine.swift
• Sources/ParseSwift/Authentication/3rd Party/ParseMicrosoft/ParseMicrosoft.swift
• Tests/ParseSwiftTests/ParseMicrosoftAsyncTests.swift
• Tests/ParseSwiftTests/ParseMicrosoftCombineTests.swift
• Tests/ParseSwiftTests/ParseMicrosoftTests.swift

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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