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Configuration sources manager

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**Note:** 
This repo is an experiemnt. For production use [dature](https://github.com/reagento/dature/tree/main)

## Fuente

Config loading library with multiple sources

Features:

* Well-known and custom sources
* Custom values merging rules
* Loading into clean dataclasses

### Quick start

1. Create classes for your config

```python
from dataclasses import dataclass

@dataclass
class Config:
    token: str
```

2. Load config from environment variables. Here, it will look for `TOKEN`

```python
import fuente

loader = fuente.load_env(Config)
```

3. Customize config sources.

```python
from fuente.sources.env import EnvSource

loader = fuente.load_env(
    EnvSource(prefix="MYAPP", sep="__"), 
    config=Config,
)
```

### Running example

```shell
pip install .

cd example
export MYAPP_DATABASE_URI="sqlite:///"
python example.py --blacklist=x,y
```

### Customization

1. You can create a separate config loader to delay data loading or do it multiple times.

```python
loader = config_loader(
    EnvSource(prefix="MYAPP_"),
    config=Config,
)
config = loader.load()
```

2. You can provide custom merging rules based on adaptix predicates. 
They make sense once you have multiple sources.
```python
loader = config_loader(
    EnvSource(prefix="MYAPP_"),
    ArgParseSource(parser=arg_parser),
    recipe=[
        merge(P[Config].log_level, UseFirst()),
        merge(P[Config].blacklist, Unite()),
    ],
    config=Config,
)
```

3. Set error handling mode. You can skip unparsed fields, the whole source if it has errors of fail. Use `error_mode` argument

4. Configure each source. Depenging on type, you can pass additional arguments to each config source. It can be prefix/separator or additional parsing rules

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