chore: add a large code generator script

[martian56]

This pull request updates the demo and test suite examples to reflect recent changes to the collections API and improves code consistency. The main changes include switching from HashMap to Map, updating method calls to the new API, and ensuring all tests and demos use the latest API patterns. Additionally, the test output formatting has been slightly adjusted.

Collections API migration and demo updates:

• Updated all usages of HashMap to Map and Set initialization to use collections.new_map() and collections.new_set() in both examples/standard_library_demo.rv and examples/test_suite.rv. Method calls like set, remove, has, and add were updated to match the new immutable API, requiring reassignment after each operation. [1] [2]
• Renamed test functions and references from test_hashmap_* to test_map_* to match the new Map type. [1] [2]

Test output and code consistency improvements:

• Updated all test assertions to use format("{}") for value-to-string conversion instead of as string, ensuring consistent formatting. [1] [2] [3]
• Changed logical operators from && to and in test conditions for language consistency.
• Simplified test result output by removing emojis and using plain text in test result messages.

Entrypoint updates:

• Added main(); at the end of both demo and test suite files to ensure the main function is executed when the script runs. [1] [2]