Only run certain PRAGMAs on writer connections

[eygraber]

• foreign_key and synchronous only affect writes, so they aren't needed on reader connections
• Also prevent use of connections before schema creation/migration

[Copilot]

Pull Request Overview

This PR optimizes SQLite connection configuration by separating PRAGMA settings between writer and reader connections. The changes ensure that foreign_key and synchronous PRAGMAs are only applied to writer connections since they only affect write operations, improving performance for reader connections.

• Splits connection configuration into writer-specific and reader-specific setups
• Updates API methods to distinguish between configuration updates and connection-specific PRAGMA execution
• Adds logic to route certain PRAGMA queries to writer connections even outside transactions

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
ConnectionPool.kt	Refactored interface to separate configuration updates from PRAGMA execution, added reader/writer-specific configuration methods
AndroidxSqliteDriver.kt	Updated query routing logic to use writer connections for foreign_keys and synchronous PRAGMAs, modified setter methods to update configuration and execute PRAGMAs separately
AndroidxSqliteTransacterTest.kt	Updated test implementation to match new ConnectionPool interface with renamed methods

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