[12.x] Configure connection on SQLite connector

[hafezdivandari]

This PR moves the connection configurations logic from the SQLiteConnection class to the SQLiteConnector class, following the pattern of other database drivers. SQLite was the only DB driver that configured its connection in the Connection class instead of the Connector class. As part of this change, redundant Builder and Grammar methods have been removed. There are many pragma key/value pairs, so it doesn't make sense to have a method in both classes for each pragma key/value (added recently on #52052).

Why?

Since using multiple schemas in PostgreSQL and running test suites in SQLite is a common scenario, this PR allows us to support attaching databases in SQLite in the future without introducing a BC-breaking change.

Summary

• Moved SQLite connection configuration logic from the SQLiteConnection class to the SQLiteConnector class to be consistent with other DB drivers.
• Make a few remaining SQLite queries schema aware (continuing the work on [12.x] Enhance multi-database support #54274).
• New Schema::connection('sqlite')->pragma($key, $value = null) method to get/set a pragma value.
  • This method also accepts schema-qualified keys, for example: Schema::pragma('schema_name.journal_mode', 'wal')
• Removed redundant SQLiteGrammar::compileSetBusyTimeout(), compileSetJournalMode(), compileSetSynchronous(), compileEnableWriteableSchema(), and compileDisableWriteableSchema() methods.
• Removed redundant SQLiteBuilder::setBusyTimeout(), setJournalMode(), and setSynchronous() methods:
  • Schema::setBusyTimeout(12345) -> Schema::pragma('busy_timeout', 12345)
  • Schema::setJournalMode('wal') -> Schema::pragma('journal_mode', 'wal')
  • Schema::setSynchronous('normal') -> Schema::pragma('synchronous', 'normal')

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