implementing regionalized auth and exchangeToken

[srushtisv]

Feature: Implement Firebase Token Exchange with Tenant Configuration

Description

This PR introduces a new API for exchanging tokens with Firebase, supporting multi-tenancy through a TenantConfig struct. Key changes include:

• New Auth class:
  • Provides a factory method auth(app: FirebaseApp, tenantConfig: TenantConfig) to create an Auth instance with a specific tenant configuration.
• exchangeToken function:
  • Added an async function exchangeToken(_ idToken: String, idpConfigId: String) to handle token exchange asynchronously.
• TenantConfig struct:
  • Defines the configuration for a specific tenant, including location and tenantId.
• AuthExchangeToken struct:
  • Defines the structure of the token returned after the exchange.

API Changes

• Added Auth class with static method auth(app: FirebaseApp, tenantConfig: TenantConfig) -> Auth.
• Added exchangeToken function: func exchangeToken( idToken: String, idpConfigId: String) async throws -> AuthExchangeToken.
• Added TenantConfig struct.
• Added AuthExchangeToken struct.

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