Pipe-operator

💥 Breaking changes: imports

Two major changes have been introduced:

- Imports are no longer at the top level but are now nested their respective modules
- For the 🐍 python implementation, the available imports have changed

python
from pipe_operator.elixir_flow import elixir_pipe, tap, then
from pipe_operator.python_flow import end, pipe, start, tap, task, then, wait


If you were using the python implementation before, the migration is quite simple. Here is the mapping:

| Before | After |
| ------------- | ------- |
| `PipeStart` | `start` |
| `Pipe` | `pipe` |
| `PipeArgs` | `pipe` |
| `Tap` | `tap` |
| `Then` | `then` |
| `ThreadPipe` | `task` |
| `ThreadWait` | `wait` |
| `PipeEnd` | `end` |

🚀 New feature: async function support

The 🐍 python implementation now support **async functions** from `asyncio`.
When using `pipe`, `tap`, or `task`, you can freely pass an async or sync function as the first argument.
As for `then`, it only supports single-arg lambda function.

🔧 Other changes

- ✨ [Python] Exported classes with aliases (ie `PipeStart` is exported as `start`) for improved readability
- 🔧 [Python] Updated documentation (docstrings and [README.md](./README.md))
- 🔧 [Python] `>>` logic is now handle in each pipeable's `__rrshift__` instead of `PipeObject.__rshift__`
- 🔧 [Python] Greatly improved typing annotations (using `overload`, `override`, `TypeAlias`, `TypeGuard`, ...)

- 🚀 [Python] Added thread support with `ThreadPipe` and `ThreadWait`. See [README.md](README.md) for more details.
- ✨ [Python] Keep same `PipeObject` object throughout the pipe for improved performances
- ✨ [Python] Added the `PipeObject.history` attribute to keep track of all its values (only in debug mode)
- 🔧 [Python] Split logic into smaller modules: [base.py](pipe_operator/python_flow/base.py), [extras.py](pipe_operator/python_flow/extras.py), [threads.py](pipe_operator/python_flow/threads.py)

- ✨ [Python] Added `__slots__` to classes for improved performances
- ✨ [Python] Added custom `PipeError` exception class for better error handling
- 🐞 [Elixir] Fixed error message for the `then` function

- ✨ Official support for Python `3.13`
- 🔧 Fixed typo in project description
- 🔧 Fixed typo in GitHub action step names and added comments
- 🔧 Added missing GitHub action in [CHANGELOG.md](CHANGELOG.md)
- 🔧 Updated [README.md](README.md) with a **Performances** block
- 🔧 Updated [CONTRIBUTING.md](CONTRIBUTING.md) documentation
- 🔧 Moved `coverage` config into [pyproject.toml](pyproject.toml)

- ✨ Classes and functions can now be imported directly, without going through submodules
- 🔧 Fixed [README.md](README.md) "Build" badge to use the **release** events

- 🔧 Updated [CHANGELOG.md](CHANGELOG.md) design
- 🔧 Updated [README.md](README.md) content
- 🔧 Updated dev dependencies