[FEATURE] Add handle exceptions for exception handlers

Example of use

    @app.exception_handler(errors.BaseError)
    async def handle_BaseError_error(request, exception):
        raise fastapi.exceptions.HTTPException(400, format_ccxt_errors(exception))

Expect fastapi return response. Got 500 error.

It needs for unifying responses in api.

[phy25]

My two cents: I guess exception handlers are supposed to deal with its own exceptions (probably by try...catch...) or you will kind of get into a loop…

[github-actions[bot]]

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