feat: add create_table DSL, struct mapping, and extended type support

[Kelvin-laai]

• Introduced DECLARE_SQLITE_FIELDS macro for declarative mapping of C++ structs to SQLite tables.

  • Enables ORM-style interaction by registering fields and their corresponding column names.
  • Simplifies querying and data binding using typed structs like UserInfo.

• Implemented fluent db.create_table("table") DSL for defining SQLite schemas in a readable, chainable syntax.

  • Supports field types (INTEGER, TEXT, BLOB, REAL), constraints (NOT NULL, PRIMARY KEY, AUTOINCREMENT), default values, and string size limits.
  • Used to define tables such as "user" and "people" with full schema control.

• Extended support for standard library numeric and boolean types:

  • Added explicit specializations for bool, int16_t, uint16_t, int32_t, uint32_t, int64_t, uint64_t.
  • Improved value extraction and binding from SQLite statements.
  • Enhanced type safety and range checks when enabled via SQLITELIB_ENABLE_TYPE_CHECKING.

• Comprehensive test coverage added:

  • Insertion and querying of structured data.
  • Field binding and result iteration.
  • Exception handling for invalid operations and malformed queries.

This change significantly improves the usability, expressiveness, and robustness of the SQLite ORM layer.