fix fv str-to-int

[rsoeldner]

This PR fixes the order of parameters (in case base is defined) to match documentation https://pact-language.readthedocs.io/en/latest/pact-properties-api.html?highlight=str-to-int#str-to-int. Additionally, we re-organize str-to-int str and str-to-int base str to be close to each other. I've added a property test case for both cases.

fixed #1303

PR checklist:

• [x] Test coverage for the proposed changes
• [x] PR description contains example output from repl interaction or a snippet from unit test output
• [ ] Documentation has been updated if new natives or FV properties have been added. To generate new documentation, issue cabal run tests. If they pass locally, docs are generated.
• [ ] Any changes that could be relevant to users have been recorded in the changelog
• [ ] In case of changes to the Pact trace output (pact -t), make sure pact-lsp is in sync.

Additionally, please justify why you should or should not do the following:

• [ ] Confirm replay/back compat
• [ ] Benchmark regressions
• [ ] (For Kadena engineers) Run integration-tests against a Chainweb built with this version of Pact