Cardano Updates

fix(readme): update pip install command for safety

Change pip install instructions to use -U and --require-virtualenv flags.
This ensures users upgrade Cardonnay if already installed and prevents
accidental global installations outside a virtual environment.

Merge pull request #42 from IntersectMBO/simplify_make_install

Mention `cardano-submit-api` as an optional dependency in the README
to inform users about its availability and potential use.

fix(makefile): remove install_dev target and update install

fix(makefile): remove install_dev target and update install

The Makefile no longer includes a separate install_dev target. The install
target now installs development dependencies by default using
requirements-dev.txt.

docs(readme): add PyPI badge and update install command

Added a PyPI version badge to the README for better visibility of the
latest release. Updated the installation instructions to use `pip
install cardonnay` instead of `make install` for clarity and to align
with standard Python package installation practices.

refactor: unify workdir argument naming across modules

Standardize the naming of the work directory argument from `work_dir` to
`workdir` across all CLI modules and function signatures. This improves
consistency and reduces confusion when passing or referencing the work
directory parameter. Also, update all internal variable names and usage
to match the new convention.

feat: add submit_api_port to InstanceInfo and extraction logic

- Introduce `get_submit_api_port` to extract the Submit API port from the
  `run-cardano-submit-api` file using regex.
- Add `submit_api_port` field to `InstanceInfo` model.
- Populate `submit_api_port` in `get_testnet_info` if available, otherwise set
  to None.

fix(inspect_instance): normalize supervisor.conf line endings

Replace set(readlines()) with a set comprehension that strips trailing
carriage return and newline characters from each line in supervisor.conf.
This ensures consistent line comparison regardless of platform-specific
line endings and prevents subtle bugs when checking for program entries.

fix(instance): make start_pid optional if not positive

Previously, start_pid was always set as an integer, even if its value
was not positive, which could lead to confusion or errors when a valid
PID was not available. This change updates the InstanceInfo model to
allow start_pid to be None, and ensures that get_testnet_info sets
start_pid to None if it is not greater than zero. This improves clarity
and correctness in representing the absence of a process ID.

feat: add pydantic models for structured JSON output

Refactor instance, pool, faucet, and config inspection commands to use
pydantic models for structured JSON output. Update helpers to support
printing pydantic models as JSON. Refactor CLI and inspect logic to
return model-based data, improving type safety and consistency. Update
README examples to match new output format. Add pydantic as a required
dependency.

fix(cli): prevent create with custom workdir if default running

If a custom work directory is specified and there are running instances
in the default workdir, the command now aborts with an error. This
prevents conflicts and ensures users stop default instances before
proceeding with a custom workdir.

refactor: rename cli_utils to ca_utils across codebase

Renamed the `cli_utils` module to `ca_utils` throughout the codebase for
consistency and clarity.

feat(json): support Path and datetime in JSON output

fix(makefile): use 'command -v' instead of 'type' for twine check