feat: Add sqlite3_compileoption_used and sqlite3_compileoption_get

[developerjamiu]

Problem

The Dart sqlite3 package (package:sqlite3) unconditionally calls sqlite3_compileoption_used via FFI during initialization to check whether ENABLE_COLUMN_METADATA is available. Since this library doesn't export that symbol, any SELECT query crashes at runtime with:

Failed to lookup symbol 'sqlite3_compileoption_used': /usr/lib/libsqlite3.so: undefined symbol: sqlite3_compileoption_used

Root Cause

The sqlite3 Dart package evaluates a lazy global in bindings.dart:

final hasColumnMetadata =
    ffiBindings.sqlite3_compileoption_used('ENABLE_COLUMN_METADATA') != 0;

This is triggered on the first SELECT query via _selectResults → _tableNames → hasColumnMetadata. The FFI lookup fails because the symbol doesn't exist in the library.

Fix

Added two functions from the SQLite C API:

• sqlite3_compileoption_used(const char*) — returns 1 for ENABLE_COLUMN_METADATA (since sqlite3_column_table_name is already implemented), 0 for everything else
• sqlite3_compileoption_get(int) — returns the compile option at index N, or NULL if out of range

Both match the official SQLite API signatures.