[Feature Request] Unify `loaders` interfaces

[lightaime]

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Motivation

The interfaces of loaders https://docs.camel-ai.org/key_modules/loaders.html is totally different. We should introduce a BaseLoader to unify the interfaces.

Rename xxx_reader to xxx_loader for better readability.

Solution

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Alternatives

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Additional context

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[JoyceXu02]

@Wendong-Fan , I can take this one. Besides, I will probably need more information about BaseLoader.

[Wendong-Fan]

Thanks @JoyceXu02 ! This abstract class need to defines the standard interface that all loaders must implement and providing a unified way to load and process different types of data sources

some components could be: init(config): Common configuration initialization load(source, **kwargs): Main abstract method for loading data supported_formats: Property to declare supported formats

let me know if there's anything else I could support!